Quick answer: If most of your leads come from traditional Google search results, an SEO agency still delivers value. If your prospects are increasingly using AI tools like ChatGPT, Perplexity, or Google AI Overviews to find and evaluate providers, you need a GEO agency — or at minimum, a GEO programme alongside your SEO. For regulated B2B sectors, GEO is rapidly becoming the higher-priority investment.
The Search Landscape Has Split in Two
For twenty years, the question was simple: do we need an SEO agency? The answer was almost always yes. Google dominated search, organic rankings drove traffic, and traffic drove revenue.
That world has not disappeared, but it has been joined by something fundamentally different. AI-powered search — ChatGPT, Perplexity, Gemini, Google AI Overviews, and the growing ecosystem of AI assistants — now mediates a significant and rapidly growing share of commercial discovery. When a buyer asks an AI system to recommend a provider, compare options, or explain the best approach to a problem, the response is not a list of ten blue links. It is a synthesised answer that names specific businesses, cites specific sources, and carries implicit endorsement.
This creates two distinct visibility challenges. Traditional SEO addresses the first: ranking well in Google’s organic results. GEO — Generative Engine Optimisation — addresses the second: being the business that AI systems cite by name when answering questions in your market.
The agencies that serve these two challenges are different in methodology, measurement, and mindset.
What a Traditional SEO Agency Does
A traditional SEO agency focuses on improving your visibility in Google’s organic search results. The core disciplines include technical SEO (ensuring your site is crawlable, fast, and properly structured), on-page optimisation (aligning content with search intent and target keywords), content strategy (creating pages and articles that attract organic traffic), and link building (earning backlinks that signal authority to Google’s algorithms).
SEO agencies measure success through rankings, organic traffic, click-through rates, and conversions from organic search. They work within a well-established framework that has evolved over two decades and is supported by mature tools, established best practices, and extensive industry benchmarks.
For many businesses, traditional SEO still delivers significant value. Google’s organic results still drive substantial traffic, particularly for informational and navigational queries. If your business depends on high-volume organic traffic — if you are an e-commerce brand, a content publisher, or a local service provider — SEO remains a core discipline.
The limitation of traditional SEO is that it was designed for a world where Google’s ten blue links were the primary interface between searchers and information. That world is contracting.
What a GEO Agency Does
A GEO agency focuses on ensuring your business appears in AI-generated responses — the synthesised answers produced by ChatGPT, Perplexity, Gemini, Google AI Overviews, and other generative AI platforms.
The methodology is fundamentally different from traditional SEO. GEO involves entity signal engineering (establishing your business as a recognised knowledge entity that AI models can identify and evaluate), citation pathway development (creating the structured content and authority signals that AI models need to confidently cite your business), cross-platform AI monitoring (tracking how your business appears across multiple AI systems, not just Google), and authority architecture (building the topical authority structures, structured data, and cross-referencing signals that AI models use to determine trustworthiness).
GEO agencies measure success through AI citation rates, brand mention frequency in AI responses, citation accuracy, and the commercial outcomes that flow from AI-mediated discovery. The tools and frameworks are newer and more specialised, reflecting a discipline that is still maturing but already delivering measurable commercial impact.
The critical difference is this: SEO optimises for algorithms that rank web pages. GEO optimises for AI models that synthesise knowledge and make recommendations. These are different systems with different inputs, different evaluation criteria, and different outputs.
How to Decide Which You Need
The decision framework is more straightforward than most agencies would have you believe.
Your primary need is SEO if your business generates most of its leads through high-volume organic search traffic. If you sell products or services that people search for in large numbers, if your website depends on ranking for hundreds or thousands of keywords, and if most of your prospects click through from traditional search results — SEO is still your core discipline.
Your primary need is GEO if you operate in a high-value B2B market where buying decisions involve research, evaluation, and shortlisting. If your average deal value is significant, if your sales cycle involves multiple stakeholders conducting independent research, and if your prospects are increasingly using AI tools to find and evaluate providers — GEO is where your competitive advantage lies.
You need both if your business relies on organic search traffic for volume but also competes for high-value opportunities where AI-mediated discovery is growing. This is increasingly common: SEO drives awareness and top-of-funnel traffic, while GEO ensures you are cited by name when AI systems answer the specific buying questions that lead to revenue.
For regulated sectors — financial services, legal, healthcare, construction — the balance is tipping firmly toward GEO. These industries have complex buying journeys, high deal values, and sophisticated buyers who are early adopters of AI-powered research tools. If you operate in one of these sectors and you do not yet have a GEO programme, the gap between your business and your AI-visible competitors is widening every month.
Start With an AI Visibility Audit
The best way to determine whether SEO, GEO, or both should be your priority is to understand where you stand today. MarGen’s free AI Visibility Audit reveals exactly how your business appears across ChatGPT, Perplexity, Gemini, and Google AI Overviews — giving you the data to make an informed investment decision.
Request your free AI Visibility Audit and see the AI search landscape through your buyers’ eyes.