Google Ads or Meta Ads: Choosing by Job, Not by Preference

Paid Media
Written By wevisualise designs

Most businesses pick a paid channel the way they pick a restaurant: on a hunch, a bad experience, or what a peer said last month. The two platforms are not rivals doing the same job badly. They answer different questions, and the right choice follows from which question you actually have.

Two systems, two questions

Google Ads answers "who is looking for this right now". Someone types a query, and you pay to appear against it. The demand already exists. Your job is to be present, relevant, and easy to buy from.

Meta Ads answers "who would want this if they saw it". Nobody on Instagram is searching for your service. Your job is to interrupt a scroll with something specific enough to create a want that was not there ten seconds earlier.

That difference sets everything downstream: how you target, how much creative you need, how you measure, and how quickly results appear.

The UK market splits its money roughly along that line. IAB UK research with Oliver Wyman, published on 03 March 2026, put UK digital advertising at £40.5bn for 2025. Search took 44 per cent at £17.9bn, growing 6 per cent. Social took £11.5bn, growing 21 per cent. Search is the bigger pool. Social is growing faster.

Both audiences are there. Ofcom reported in its 2025 online habits research that Google Search reaches 82 per cent of UK adults with around three billion searches a month, while Facebook and Messenger reach 93 per cent and YouTube 94 per cent. Reach is not the deciding factor. Intent is.

How each platform finds a person

The targeting mechanics are genuinely different, and understanding them explains most of the practical differences in running them.

Google matches on the query. Google Ads Help defines three keyword match types. Broad match: "Ads may show on searches that are related to your keyword, which can include searches that don't contain the direct meaning of your keywords." Phrase match: "Ads may show on searches that include the meaning of your keyword." Exact match: "Ads may show on searches that have the same meaning or same intent as the keyword." Even exact match is meaning based, not literal, which is why negative keyword lists remain necessary work rather than optional tidying.

Meta matches on people. Its lookalike audience documentation describes taking "several sets of people as 'seeds'" and building "an audience of similar people". The requirements are concrete: a custom audience of at least 100 people, or at least 100 unique conversions from campaigns. A similarity setting targets "the top 1% of people in a selected country who are most similar to the seed Custom Audience", a greater reach setting takes the top 5 per cent with a less precise match, and the ratio can be set manually from 1 per cent to 20 per cent.

The consequence is direct. Google performance depends on the quality of your keyword and query data. Meta performance depends on the quality of your customer data. If you have no customer list and no conversion history, Meta is starting with less to work with than most pitches admit.

Both run auctions, but they price different things

Google Ads Help lists six factors in its auction: your bid, ad and landing page quality, Ad Rank thresholds, auction competitiveness, the context of the search including location device and time, and the expected impact of ad assets. Bidding is anchored to a query.

Meta's Marketing API documentation describes its bidding differently: "Facebook evaluates your bid_amount and the probability of reaching your optimization_goal. We apply an effective bid so you only win auctions and have your ads delivered when you are likely to reach your optimization_goal." Bidding is anchored to a predicted outcome for a person.

In practice, Google punishes irrelevance against a query, Meta punishes creative that people do not act on. Both discount advertisers whose ads perform, but they measure performance against different things.

Creative dependency is the workload difference

This is the factor most underestimated at the point of choosing.

A Google search campaign can run for a quarter on well written responsive search ads and a solid landing page. Text does not fatigue quickly because each impression is served against a fresh query.

Meta consumes creative. Instagram's own explanation of ranking states that "Instagram doesn't have a singular algorithm that oversees what people do and don't see on the app", and lists post information, poster information and interaction history among the signals it reads. Ads compete for attention inside that same personalised environment. When a creative stops earning attention, delivery falls away, and the fix is new creative rather than a bid change.

Budget accordingly. A Meta programme without a monthly creative allowance is a Meta programme with a three week lifespan.

There is a second reason this matters in the UK right now. Ofcom research published on 02 April 2026 found that around 49 per cent of adult social media users actively post, share or comment, down from 61 per cent in 2024. Audiences are watching more and interacting less, so social creative has to earn a click from people who are behaving passively.

Measurement & attribution will not agree

Expect the two platforms to disagree about the same month, and know why before you look.

Google's data-driven attribution "gives credit for conversions based on how people engage with your various ads", using clicks and video engagements across Search, Shopping, YouTube, Display and Demand Gen. Google recommends at least 200 conversions and 2,000 ad interactions in a 30 day period for the model to work well.

Meta counts differently. Its Ads Insights API documentation states: "The conversion attribution window provides timeframes that define when we attribute an event to an ad on Facebook." If no window is specified, the API default it describes uses 28 day click and 1 day view. A view-through conversion has no equivalent in a search campaign, because nobody passively sees a search ad.

So a customer who saw a Meta ad on Monday, searched your brand on Thursday and converted will often be claimed by both platforms. Neither is lying. They are answering different questions about the same purchase.

Two practical responses. Use one independent source of truth, usually Google Analytics 4 or your CRM, for the number the business acts on. And run server side event tracking where you can. Meta's Conversions API sends events from your server, and Meta states those server events are processed in the same way as browser pixel events for measurement, reporting and optimisation.

The comparison, in one table

Factor Google Ads Meta Ads
Core job Capture demand that already exists Create demand that does not yet exist
Targeting basis Query and match type Seed audiences and predicted behaviour
Needs to work Good keyword and query data Good customer and conversion data
Creative load Low to moderate, text led High, continuous, video led
Speed to first lead Fast where intent exists Slower, needs a learning period
Typical CPC on commercial terms High. UK examples include £25.37 for "ppc agency" and £41.84 for "cost per lead" Usually lower per click, higher volume of low intent clicks
Attribution default Data-driven across Google surfaces 28 day click, 1 day view in the Insights API default
Best fitted to Established categories, urgent needs, branded search defence New propositions, visual products, wide audiences, retargeting

The cost per click figures come from the Semrush UK database, retrieved on 05 August 2026, and illustrate how expensive high intent search terms become in competitive sectors.

A decision list

Work through these in order. The first clear answer wins.

  1. Does anyone search for what you sell? Use a keyword tool honestly. If monthly UK volume for your commercial terms is in the low hundreds, paid search cannot deliver meaningful volume regardless of budget. Start with Meta.
  2. Is the need urgent or scheduled? Emergency plumbing, legal deadlines, replacement parts. Urgency is a search behaviour. Start with Google.
  3. Is the product visual or does it need explaining? If a photograph or a fifteen second video sells it better than a sentence, Meta has the advantage.
  4. Do you have a customer list of at least a few hundred people? That is the fuel for lookalike audiences. Without it, Meta targeting starts cold.
  5. Can you produce new creative every month? If not, do not commit meaningful budget to Meta.
  6. Are competitors bidding on your brand name? Then a small defensive Google campaign is not optional, whatever else you run.
  7. Is your average order value high with a long consideration period? You will need both, plus retargeting between them.

When running both is the only honest answer

Two situations make a single channel indefensible.

The first is a considered purchase over £1,000 with a sales cycle longer than a fortnight. People will not decide in one session. Meta builds awareness, Google catches the resulting branded and category searches, and neither works properly alone.

The second is a new proposition in a category with no established search behaviour. Nobody searches for something they cannot name. You create the demand on social, then capture it on search as the language spreads.

In both cases, the sequencing matters more than the split. Run Meta first to create the searches, then measure whether branded search volume rises. If it does not after eight weeks, the creative is the problem, not the channel choice.

What to do next

  1. Write down the question your business actually has: are people looking for this, or do they need to be told it exists. Everything else follows from the answer.
  2. Pull twelve months of UK search volume for your five most commercial terms before committing to paid search. Low volume is a decision, not a setback.
  3. Count your usable customer list. Under a few hundred records, prioritise collecting data before spending on Meta lookalikes.
  4. Set an independent source of truth for conversions, in Google Analytics 4 or your CRM, and agree with everyone that platform numbers are directional.
  5. Budget creative separately from media if Meta is in the plan. A fixed monthly allowance for new assets, agreed in advance, prevents the quiet decline that follows creative fatigue.

Channel choice is a diagnosis, not a taste. Get the diagnosis right and a modest budget performs; get it wrong and no amount of optimisation rescues it. Our paid media work begins with that diagnosis rather than with a platform recommendation.

Sources

wevisualise designs https://wevisualise.co.uk
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