How to Choose a Marketing Agency: 5 Key Criteria

Choosing the right marketing agency is one of the most important strategic decisions you will make as a business owner, marketing director or manager. In today’s highly competitive digital environment, a great product or service is no longer enough. You need a team of experts who can get your offer in front of the right audience, at the right time and with the highest possible return on investment (ROI). Yet there are hundreds of players on the market, from independent freelancers and narrowly specialised boutique studios to huge international networks. How do you find a reliable partner in that crowded sea, one that will genuinely support the growth of your business? In this in-depth guide from the experts at 2bo.uk, we look closely at 5 absolutely key criteria that will help you tell average suppliers apart from true professionals.

If you want a short, direct answer to the question of how to choose a marketing agency, here it is: look for proven results, complete transparency, deep expertise in the key disciplines (SEO, PPC, social media management), shared company values and clearly defined pricing focused on return on investment. A great agency does not hide its data behind complicated jargon and does not hold you hostage by owning your advertising accounts. Instead, it works as an extension of your in-house team, and its success is directly proportional to your growth.

Why choosing the right marketing agency matters so much

Digital marketing has been transformed over the past decade. The days when it was enough to „switch on a Facebook ad“ or „write a few articles for SEO“ are gone for good. Search engine algorithms are now powered by artificial intelligence, advertising platforms require sophisticated conversion tracking (including Consent Mode v2 and server-side tracking), and attention spans on social media are shorter than ever. For a campaign to succeed, many specialisms have to work together: data analytics, creative copywriting, graphic design, technical development and strategic planning.

A poor choice of agency does not just mean losing the money you paid in fees. The real losses go much deeper. They include budget burned on ineffective campaigns, market share lost to competitors, damage to your brand from the wrong kind of communication and, above all, the loss of precious time. If you spend a year working with an incompetent agency, your competitors gain a year’s head start in building organic traffic (SEO) and optimising their conversion paths.

On the other hand, a partnership with a top agency such as 2bo.uk can be truly transformational for your business. It gives you access to the latest technology and know-how, lets you scale your revenue without hiring an expensive in-house team of specialists, and brings an outside strategic perspective that internal teams often lack because they are simply too close to their own operations.

Core services a full-service agency should master

Before we dive into the selection criteria themselves, it is worth defining what a modern full-service (or strongly specialised) digital agency should actually be able to do. Even if you initially hire an agency for one specific job, it is a big advantage when it also reaches into other areas. Marketing channels do not work in isolation; they influence and complement each other (the so-called omnichannel approach).

SEO (search engine optimisation)

SEO is not a one-off project but a continuous process of building your website’s authority and relevance in the eyes of search engines (above all Google). Good SEO brings a long-term flow of highly relevant traffic that you do not pay for click by click. A professional agency focuses on three main pillars of SEO:

• Technical SEO: flawless indexing, loading speed, mobile responsiveness, a clean URL structure, SSL certificates and Core Web Vitals optimisation. A fast, technically healthy website is the absolute foundation.
• On-page SEO and content strategy: creating high-quality content that matches the user’s search intent. This includes keyword research, optimised headings (H1, H2), meta tags, internal linking and building topical authority. Modern E-E-A-T principles (Experience, Expertise, Authoritativeness, Trustworthiness) come into play here.
• Off-page SEO (link building): earning high-quality, relevant and authoritative backlinks from other websites. A good agency never uses spam techniques (buying links from dubious link farms); it builds a natural link profile through digital PR, guest posting and unique data-driven content.

PPC advertising (pay-per-click)

While SEO delivers results over months, PPC campaigns can generate sales and enquiries almost immediately. You pay only when a potential customer actually clicks your ad. An experienced agency will manage and optimise your campaigns across all the key platforms:

• Google Ads: from classic search text ads, dynamic campaigns and product ads (Google Shopping) to the latest Performance Max (PMax) campaigns, which use Google’s machine learning to maximise conversions across its entire inventory (YouTube, Display, Gmail, Search).
• Local search platforms: in some markets local players still matter a great deal. On the Czech market, for example, that is Sklik, an important platform especially for the B2B segment and older audiences who use the Seznam.cz homepage.
• Social media advertising (social ads): Meta Ads (Facebook and Instagram) for precise demographic and interest targeting, LinkedIn Ads for high-value B2B acquisition, or TikTok Ads to reach a younger generation with vertical video.
• Advanced remarketing: reaching users again who have visited your website but did not complete a purchase, including dynamic remarketing that shows people exactly the products they were looking at.

Social media management (social media marketing)

Being on social media is a necessity today, but simply „creating posts“ does not work. You have to build a community around your brand. A good agency does not just publish generic content; it creates a strategy tailored to the specifics of each platform.

• Visual identity and tone of voice: so that your brand looks consistent and memorable on social media and communicates its values the same way everywhere.
• Native content creation: static graphics, carousels and, above all, popular short vertical videos (Reels, TikTok, YouTube Shorts), which currently have the greatest organic reach.
• Community management: proactive communication with followers, replying to comments, moderating discussions and handling crisis situations (such as negative reviews).
• Influencer marketing: finding and partnering with creators who share your brand’s values and whose audience overlaps with your target group.

Criterion 1: Transparency, fair communication and reporting

Transparency is the absolute foundation of a healthy client–agency relationship. If you feel that an agency wraps its processes in mystery and throws complicated acronyms at you without explanation, that is the first strong warning sign. As the client, you need to know exactly what you are paying for, what is being worked on and what results it brings.

Ownership of data and advertising accounts

This rule is non-negotiable: all advertising accounts (Google Ads, Meta Business Manager and others), analytics tools (Google Analytics, Google Tag Manager) and other platforms must always belong to you. The agency should only be granted access with administrator or editor rights. If an agency tells you it has to run your campaigns in its own company account and will not hand the data over when the cooperation ends, walk away immediately. Otherwise you would be paying for data and historical optimisation that the agency keeps at the end, and you would have to start again from zero. At 2bo.uk we always set up accounts in the client’s name and guarantee 100% ownership.

What good reporting looks like

Receiving an auto-generated PDF full of charts at the end of the month that nobody in your company understands is not good reporting. A great agency can not only collect data but, above all, interpret it in the context of your business. Reporting should be live, ideally through interactive dashboards (for example in Looker Studio) that give you access to the data 24/7.

Speed and style of communication

In the digital world, speed is often decisive. If your website goes down or your product feed for a price comparison site breaks, you cannot wait three days for a reply. Ask in advance how day-to-day communication works at the agency. Who will be your main point of contact (account manager)? Will you also have direct contact with the specialists (the PPC specialist, the SEO consultant)? Does the agency use modern client communication tools such as Slack, Basecamp, Trello or Asana? Fixed rules for response times, a so-called SLA (service level agreement), should be part of the contract.

Criterion 2: Proven results, case studies and references

Any agency can claim to be the best on the market, but only hard data and the real results of its clients carry weight. When choosing a partner, you cannot rely on a nice website and the promises of sales reps. You have to ask for evidence. And, more importantly, you have to know how to read that evidence.

Beware of vanity metrics

A common tactic of less reputable agencies is to impress clients with big numbers that have no impact on the real business. These are the so-called vanity metrics. The agency boasts: „We increased the reach of your Facebook posts by 300% and brought 10,000 new visitors to your website!“ That sounds great until you ask the most important question: „And how many of those 10,000 visitors bought something?“ If the answer is close to zero, the agency has just burned your budget on irrelevant, low-quality traffic (often with clickbait ads or badly targeted campaigns). Real case studies must focus on business goals: higher revenue, better margins, a lower cost-to-revenue ratio, more qualified leads (enquiries) from relevant B2B clients, or a higher customer lifetime value (CLV).

How to analyse a case study

When an agency shows you a case study, look for a specific structure. A good case study is not just showing off; it is the story of solving a problem. It should contain these elements:

• Starting point (the problem): what state was the client in when they came to the agency? (For example: an online store had stagnated at a monthly turnover of around CZK 1 million, ad costs were an unsustainable 25% of revenue and the website had technical flaws.)
• Strategy and solution (what the agency did): which approach did they choose? (For example: we carried out an in-depth SEO audit, migrated to a new platform, restructured the PMax campaigns and cut ineffective keywords.)
• Result (numbers and time frame): how long did the results take and what exactly were they? (For example: within 6 months we reduced ad costs from 25% to 12% of revenue while total turnover grew by 40%.)

Ask for references and pick up the phone

The best way to verify an agency’s claims is to contact its current or former clients. Don’t be afraid to ask the agency for 2–3 contacts at clients in a similar industry or of a similar size to yours. Email or call them and ask about their real experience. Find out not only whether the agency meets its goals, but also how it treats clients when things are not going well. Every campaign can have a weaker month; what matters is how the agency responds, whether it analyses the problem and proposes a solution, or buries its head in the sand and looks for excuses.

Criterion 3: Real expertise and a senior team

It happens quite often that a charismatic agency director and senior strategists turn up at the first sales meeting and dazzle you with their ideas and vision. You sign the contract, and right afterwards your project is handed over to junior employees or interns who are still learning on your budget. This is known as „bait and switch“, and you need to watch out for it.

How to check the quality of the experts

Ask directly who exactly will work on your project. Ask for a short introduction of these specialists and ideally meet them in person or online before signing the contract. Ask them specific technical questions about your industry.

Certifications, partnerships and continuous learning

Although certification alone does not guarantee top results, it is a good indicator that an agency keeps up to date. Look for statuses such as Google Premier Partner or Meta Business Partner, or certifications for local platforms. These badges mean that the agency manages certain minimum (usually very high) budget volumes, maintains a high standard of campaign performance according to the strict criteria of the ad networks, and that its staff regularly pass demanding exams. On top of that, such agencies have access to beta features of the ad systems and direct support from Google or Meta, which they can use in your favour when dealing with suspended accounts or other crises.

Another aspect is educating the market itself. Good agencies such as 2bo.uk do not keep their know-how to themselves. They speak at industry conferences, publish expert articles, record podcasts and educate their clients. An agency that understands its craft can explain complex concepts simply and clearly to anyone.

Criterion 4: Shared values, business understanding and cultural fit

Many companies choose an agency purely on the basis of spreadsheets: they compare prices, services and promised KPIs. In doing so, they forget one of the most important criteria, the so-called cultural fit, meaning a match in culture and values. A marketing agency becomes one of your key business partners. You will probably be in contact with these people every week. If you don’t get on with them, or if they work at a completely different pace or approach problems differently, the cooperation will sooner or later hit its limits, no matter how good they are technically.

Understanding your segment (B2B vs B2C)

Every business is unique. The way fast-moving consumer goods (fashion, cosmetics, electronics) are sold in B2C is fundamentally different from selling complex industrial machinery or business software (SaaS) in B2B. Find out whether the agency has experience in your industry. Does it understand that in B2B the buying process (the customer journey) can take twelve months and needs approval from several managers? Does it know that in such a case a campaign’s success cannot be measured by an immediate online transaction, but by generating highly qualified leads (SQL, sales qualified leads)?

The agency does not have to work exclusively in your specific industry (too narrow a specialisation can lead to recycling the same ideas), but it must show the willingness and ability to dive deep into your business. It has to want to understand your products, your margins, your production capacity and your biggest competitors.

The agency as an extension of your team

The best results come from close partnership. An agency should not work like a print shop where you send a brief and get an output back without a second thought. A real partner (which is what we aim to be at 2bo.uk) can respectfully challenge your views. If a client asks for a pointless campaign that would waste money, a good agency talks them out of it and offers a working alternative. Look for an agency that is proactive: one that comes up with new ideas itself, points out new trends in the digital space and suggests improvements to your website or sales funnel beyond its basic brief.

Criterion 5: Pricing, cooperation models and return on investment (ROI)

Price is, of course, one of the main factors when choosing an agency. But the cheapest agency on the market can end up costing you the most. Why? Because ineffective campaigns consume your expensive ad budget without bringing relevant sales. When weighing up the costs, don’t look only at the hourly rate or the monthly fee, but above all at the expected return on that investment.

Common pricing models of marketing agencies

Marketing agencies use several different remuneration models. It is essential to understand which model you are being offered so that you can compare competing proposals fairly:

Pricing model	How it works	Who it suits
Hourly rate (time & material)	You pay for the hours actually worked, based on a pre-agreed rate and approved time estimates.	Ad-hoc tasks, one-off audits, consulting and projects with a variable workload.
Monthly retainer	A fixed monthly payment covering an agreed package of services (for example PPC management and 4 SEO articles a month).	The most common model for long-term management. It gives the client predictable costs.
Percentage of media spend	The agency charges a percentage of the budget spent (for example 10–15% of the spend in Google Ads).	Often used by very large online stores. It can, however, motivate the agency simply to spend money regardless of ROI.
Performance model (success fee)	A reduced base fee plus a variable part tied to hard goals (for example a share of the profit from new orders).	A great shared-risk model. It does, however, require perfectly set up and trustworthy analytics on both sides.

Cheap vs expensive services: what are you really paying for?

If you come across an offer that is noticeably cheaper than the market average, be careful. It is probably based on one of the following compromises:

• Too little time for your project: an agency with extremely low fees has to take on a huge number of clients per specialist to make a living. Your project then gets a few hours a month at most, which is enough for routine budget tweaks but leaves no time for strategy or testing new ideas.
• Outsourcing to unqualified workers: cheap agencies often pass the work to inexperienced juniors or delegate it to low-cost countries without telling the client, which leads to disastrous mistakes in both the set-up and the copy.
• Hidden fees: a low „starter“ retainer can be a lure, but then you find out that every call with the account manager or every small design change is charged extra at absurd rates.

A good agency sets its prices transparently. It will openly explain how many hours it plans to spend on your project, which specialists it will involve and what budget it recommends for the ad platforms (the media budget is always paid separately, directly to providers such as Google or Meta, apart from the agency’s fee).

Red flags: when to walk away from an agency

During the selection process you may come across practices that should be an immediate signal to end the talks. Avoid agencies that:

• Guarantee first place on Google: no agency in the world owns Google. The algorithms change constantly and thousands of factors play a part. If someone promises you a 100% guaranteed number-one position for a highly competitive keyword within a month, they are probably either lying or planning to use forbidden „black-hat“ SEO practices that will soon lead to a harsh penalty and your website being removed from search results.
• Refuse to show data in real time: „You can’t look into the ad account, that’s our know-how.“ This is the biggest red flag of all. The campaign set-up, the keywords, the ads: all of this is your intellectual property if you are paying for its creation and management.
• Demand long contracts with no way out: of course SEO and PPC need time to show results (often 3–6 months). But a reputable agency will not push you into signing a non-cancellable two-year contract at the very first meeting. Fair contracts are open-ended with a standard notice period (typically 1–3 months).
• Take a template approach: they turn up at the meeting and immediately push a „Gold SEO package for CZK 5,000“ without asking about your history, your competitors or your goals. Every business needs a tailored strategy, not an off-the-shelf boxed service.

In-house team vs external marketing agency

While reading this guide you may be thinking: „Wouldn’t it be simpler in the end to hire our own full-time marketing person?“ The answer: it depends on your size, budget and goals. Both approaches have clear advantages and disadvantages.

An in-house marketing specialist (an internal employee) knows your product inside out. They live and breathe your company, are available right away in the office next door and can react instantly to what is happening in the business. The problem is that digital marketing is now so complex that one person (a jack of all trades) cannot be a top performance analyst, a brilliant copywriter, a creative designer and a leading SEO strategist all at once. Either you lower your expectations of quality, or you build an entire internal team of 4–5 people. And then we are talking about salary costs that are many times higher every month (including payroll taxes, software licences, equipment and training).

Working with an agency, on the other hand, gives you access to a whole panel of senior specialists in different fields for a fraction of the cost of an in-house team. An agency brings experience gathered on dozens of other projects. It pays for top-tier tools (such as Ahrefs, Semrush and advanced analytics platforms) that would not be worth paying for just for one website. The ideal model that many medium-sized and large companies are moving towards is a hybrid approach: the company has an in-house marketing manager who knows the product perfectly and sets the strategic direction, while the execution (performance PPC, comprehensive SEO, media buying) is handled by a contracted expert agency.

The first 90 days: how to tell you chose well

Choosing and signing the contract is only the start of the work. The onboarding phase and the first three months usually show clearly whether you made the right decision. What should happen after the handshake?

• Month 1: audit, data and strategy (discovery phase). A solid agency does not start spending your money straight away without analysis. The first weeks are about handing over access, auditing existing campaigns, checking the analytics in depth (conversion tags, GTM) and running kick-off workshops. The output should be a concrete action plan for the period ahead.
• Month 2: implementation and fixing mistakes. The first changes are put into practice. The agency fixes the technical problems found on the website during the audit, rewrites underperforming ads, launches new campaign structures and starts creating new content. Graphics, copy and audiences are tested intensively (A/B testing).
• Month 3: first results and optimisation. The campaigns are past their learning phase, the algorithms have collected data and the agency starts cutting hard what doesn’t work and scaling up (increasing the budget) where it sees excellent ROI. By the end of the third month you should already see a clear positive shift in the data.

How to prepare for the first meeting with an agency (checklist)

If you want a relevant, well-thought-out proposal from an agency, you need to give it the right data at the start. Prepare the following information for the first meeting or call:

• Your business goals: „I want more orders“ is not enough. Be specific: „Within a year we want to grow the online store’s turnover by 30% while keeping ad costs below 15% of revenue.“ or „We need to generate 50 relevant B2B leads a month at a cost per lead below CZK 500.“
• Information about your margin (at least roughly): the agency needs to know how much you can afford to pay to acquire one customer (CPA, cost per acquisition) without losing money on the sale.
• Who your target audience is (buyer persona): who exactly are you selling to? Parents on parental leave, top managers of multinational corporations, or students? What problems are they trying to solve?
• Who your biggest competitors are: which 3–4 players on the market are taking customers from you? Where are they better, and where do they fall short?
• Your history so far: what have you done in marketing before? Which channels worked, and where did you just burn money? (This saves the agency valuable time and stops it repeating your old mistakes.)
• Budget: don’t be afraid to state your limit. A good agency will not abuse it. On the contrary, knowing the budget is key to proposing a realistic strategy. CZK 10,000 a month will not pay for a full omnichannel strategy reaching into TV, but it can fund an excellent, sharply targeted search campaign for one high-margin product.

Summary: a partnership that drives growth

Choosing a marketing agency is not like buying consumer goods; it is choosing a strategic partner for your business. Whoever you decide to approach, stick to the five key criteria we have covered in detail: insist on full transparency and ownership of your data, don’t be dazzled by so-called vanity metrics, check the real expertise of the people who will work on your project, look for a personal and company fit, and make sure the pricing is fair and focused on the return on your investment.

Successful marketing in the modern digital world requires constant testing, the ability to adapt quickly to change and the courage to innovate. With a good agency behind you, you gain these qualities immediately, which lets you focus on what matters most: developing and improving your own products and services.

Looking for a reliable marketing partner for your growth?

At 2bo.uk we build our cooperation on hard data, complete transparency and deep expertise. We are not just an external supplier; we become an extension of your team. Whether you need to move your SEO forward, maximise the performance of your PPC campaigns or own social media, we are ready to help you design a strategy that really works.

Book a free consultation