Google Ads or SEO: Where to Put the Next €1,000

“Ads or SEO” is usually argued as a matter of belief, and the two camps rarely disagree about facts. They disagree about time. Paid search buys attention now and stops the moment you stop paying. Organic search costs money before it produces anything and then keeps producing after the spending pauses. Both statements are true, which is why the question is not which channel is better but which one your business can afford to wait for.

That reframes it into arithmetic. Five numbers decide it, and most businesses have four of them already.

The five inputs

What the published benchmarks actually say

The most widely used reference is the annual search advertising benchmark set from WordStream by LocaliQ, which for the year to March 2026 puts the all-industry averages at a cost per click of $5.42, a click-through rate of 6.64%, a conversion rate of 8.18% and a cost per lead of $66.69, across more than thirteen thousand campaigns in twenty-three industries.

The spread underneath those averages is the useful part. Cost per lead runs from roughly $26.84 in arts and entertainment to $131.63 in legal services, and cost per click from around $1.63 to $9.87 across the same range. A five-fold difference between sectors means the all-industry number is a sanity check and never a plan.

Two caveats before anyone budgets from these figures. The dataset is US campaigns, and click prices in Ukraine and Bulgaria are materially lower in most categories, so the absolute numbers do not transfer even though the ratios largely do. And a benchmark describes what advertisers paid, not what the traffic was worth; a low cost per lead in a sector with 5% close rates is not a bargain.

Why comparing cost per lead between the channels is the classic error

The instinct is to divide spend by leads for each channel and pick the smaller number. It produces a confident answer and a wrong one, because the two cost structures are not the same shape.

Paid search is almost entirely marginal cost: every additional lead costs roughly what the last one did, and the cost stops when the spending does. Organic is almost entirely fixed cost, paid upfront in content, technical work and time, after which additional traffic is close to free. Comparing them in the same month compares an instalment payment to a rental.

The comparison that works is cost per lead averaged across the payback period you actually care about. Over twelve months, organic that cost a fixed sum and now produces steadily usually undercuts paid by a wide margin. Over the first three months, it produces nothing and paid wins by default. Whichever window you choose, choose it explicitly, because the window is the whole argument. The same structure underlies the break-even model for a website against ad spend.

When ads deserve the money first

• You are validating. A new product or market with no evidence of demand. Ads buy the answer in two weeks; SEO buys it in two quarters and only if you guessed the keywords correctly.
• Demand is seasonal or event-driven. If the money arrives in a six-week window, a channel with a six-month ramp is the wrong instrument.
• Capacity is the constraint. Dial-up and dial-down are properties only paid channels have.
• Your category has thin organic demand. Some things genuinely are not searched for, and no amount of content creates a query volume that does not exist.
• You need cash flow this quarter. An unpleasant but legitimate reason, and worth stating plainly rather than dressing up as strategy.

When organic deserves the money first

• Click prices in your category are high. At the legal-services end of the benchmark, a year of ads costs more than a year of content, and the content still exists afterwards.
• The buying cycle is long. People research for months before enquiring. Content is present during that research; an ad is present for one click.
• The same questions arrive repeatedly. If sales answers the same five questions weekly, those are pages, and they will convert better than any ad because they arrive earlier in the decision.
• Your site is technically broken. Spending on ads to send traffic to a site that does not convert is the most expensive way to discover you had a conversion problem, which is what the enquiry diagnosis is for.

What changed in the organic calculation recently

Two shifts are worth pricing in rather than ignoring, and neither of them makes organic pointless.

The first is the rise of results that answer without a click. A large share of searches now end on the results page, which reduces the traffic a top ranking delivers relative to five years ago. That is real, though the widely quoted headline figures need reading carefully, as covered in what the zero-click numbers actually measure.

The second is that visibility increasingly means being cited rather than ranked, in AI answers as well as classic results. The practical effect on budgeting is that organic work now buys a wider and less measurable kind of presence, and the case for it rests more on the quality of the traffic it does produce than on the volume it used to.

The honest conclusion is that organic has become slower to pay back and harder to attribute, without becoming less valuable per visitor. If anything, the visitors it delivers arrive later in the decision than they used to, which is why an unsegmented conversion comparison between channels misleads, for the reasons in how to read conversion benchmarks.

The third option, which is usually the cheapest

The framing of the question excludes the option that most often wins on arithmetic: spending the money on the traffic you already have.

The logic is unglamorous. If a site receives two thousand visits a month and converts at 1.5%, moving it to 2.5% produces twenty additional enquiries with no increase in traffic and no ongoing cost. Buying those same twenty through paid search at a hundred euros per lead is two thousand euros a month, every month, indefinitely. The conversion work is a one-off with a permanent effect, and it improves the return on both other channels at the same time.

It is skipped for two reasons, neither of them financial. It is harder to attribute, because the improvement shows up as a better rate rather than as a new line in the report. And it requires admitting that the current site underperforms, which is politically more awkward than approving a media budget.

A reasonable rule: before increasing spend on either channel, check whether the same money spent on the funnel would produce more. If the current conversion rate is below the sane range for the category, the answer is almost always yes, and it stays yes until the obvious defects are gone.

The allocation most businesses should actually run

For a business with an established offer, some traffic and no strong reason to pick a side, a split beats a choice, and the split has a rule rather than a ratio.

1. Buy the demand that already exists, now. Paid search on the handful of terms where intent is unambiguous and the customer is ready. Keep this tight; broad campaigns are where budgets go to be wasted.
2. Build the answers to the questions that come before that moment. Organic content aimed at the research stage, chosen from real questions rather than keyword tools alone.
3. Cap the paid budget at a stated cost per customer, derived from margin and close rate rather than from what feels affordable. Below the cap, spend more. Above it, fix the funnel instead of raising the cap.
4. Review the split quarterly against payback, not ROAS. Return on ad spend flatters paid because it ignores the fixed investment on the other side of the comparison.

What to measure to make the next decision easier

Whatever you choose this quarter, the decision next quarter is only easier if three things are tracked now: cost per customer by channel rather than cost per lead, time from first visit to enquiry, and close rate by source. The third is the one almost nobody has, and it routinely reverses the ranking of channels: a source with double the cost per lead and triple the close rate is the cheaper source of customers, and the standard dashboard reports it as the worse one.

The short version

The question is about time, not quality: paid buys attention now and stops when the money does, organic costs upfront and keeps producing. Five inputs settle it — margin, lead-to-sale rate, customer lifetime, cash runway and capacity to serve — and capacity is the one most often ignored and most often decisive. The 2026 benchmarks put the all-industry cost per lead at $66.69 with sectors ranging from about $27 to $132, but the data is US and works as a sanity check rather than a plan. Do not compare cost per lead between channels in a single month: one is marginal cost, the other is fixed, and the comparison only means something across a stated payback window. Ads first when validating, when demand is seasonal, when capacity is the constraint or when the category has thin search volume. Organic first when clicks are expensive, the buying cycle is long, or the same questions keep arriving. And track close rate by source, because it regularly reverses which channel looks cheaper.