"Which is better, SEO or paid search" has no honest answer, because the two channels do different jobs. The useful question is a different one: what ratio should your budget be split in right now, given your cash runway and your planning horizon. Below is a comparison across the six parameters that actually drive the decision, a cost-per-lead calculation on real numbers for both channels, and the allocation formula we give clients instead of a one-size-fits-all opinion — plus the situations where the answer is obvious and there is nothing to debate.

Renting versus owning

The shortest way to state the difference: paid search rents traffic, SEO buys an asset in instalments. While you pay per click, people arrive. Stop paying at 2pm and by 2:05pm the traffic is zero, and tomorrow you start from exactly where you were six months ago. Organic accumulates instead — a page that reaches the top keeps producing enquiries in months when you did nothing at all.

From that follows the single most important practical rule: comparing the channels on cost per lead within one month is meaningless. In month one, ads win by a landslide because SEO has not had time to produce anything. By month twelve the picture is usually reversed. Make the call on the horizon that matches your planning cycle, not the horizon of your next payroll run.

Six parameters, side by side

Predictability deserves a separate note, because it is what usually decides the question for a small business owner. With paid search you know the cost per click and the volume your budget buys before you spend it. In SEO that certainty only arrives after two or three months of work, once indexing speed and the response to early changes are visible. If your financial model cannot absorb three months of uncertainty, that is an argument for ads — not evidence that SEO is a bad channel.

What a lead actually costs from each channel

Here is the arithmetic on an example you can substitute your own numbers into. A moderately competitive service niche, $1.50 per click, landing page converting visitors to enquiries at 2%. That is fifty clicks per lead, or $75 an enquiry. Thirty leads a month costs $2,250 — and it costs that again every month, for as long as you keep paying.

1. 1Use the real click price in your niche, not a market average. The spread is enormous: consumer services often sit at $0.50–2, while legal, finance and B2B software regularly run $10–50 per click.
2. 2Divide it by your landing page conversion rate. Two identical campaigns converting at 1% and 3% differ threefold in cost per lead — which is why work on the page pays back faster than work on the bids.
3. 3For SEO, take the full twelve-month budget: typically $800–2,500 a month including content, so $10–30k for the year.
4. 4Divide that by the leads produced in the same year, remembering that the first three or four months contribute close to nothing while months ten to twelve pull the average up.
5. 5Then calculate year two separately. That is where the reversal happens: spend drops to maintenance while the traffic stays, and organic cost per lead frequently falls below $10.

How to split the budget across four stages

There is no universal ratio, but there is a logic tied to project stage. It holds for most service businesses and retailers.

1. 1

   Months 1–2: 80% ads, 20% foundation

   Ads produce revenue today and, more importantly, data: which queries convert, which objections come up, what a lead genuinely costs. That data later saves months of guesswork on keyword strategy.

2. 2

   Months 3–6: 60% ads, 40% SEO

   Technical foundation, site structure, and first pages targeting the most profitable queries identified by the ads. Paid still feeds the business while organic starts returning its first few percent of traffic.

3. 3

   Months 7–12: 40% ads, 60% SEO

   Organic is producing leads. Shift paid spend off broad terms and onto the narrow, expensive ones organic has not reached yet. It is the fastest way to bring blended cost per lead down.

4. 4

   After year one: 20–30% ads, the rest content and retention

   Ads become the instrument for launches, seasonal peaks and testing new directions. Baseline traffic is now organic and no longer rented.

Situations where the answer is obvious

One more observation from practice. The worst outcomes come not from picking the "wrong" channel but from oscillating between them: three months of ads, an abrupt switch to SEO, disappointment, a switch back. Both channels compound, just through different mechanisms — paid accumulates campaign data and historical performance, organic accumulates content and positions. Restarting from zero destroys whatever had accrued. If the total budget is tight, it is more honest to pick one channel and run it for a year than to halve the money and finish neither. How to size that total is covered in our guide to planning a digital marketing budget.

Frequently asked questions

In short

• Paid search rents traffic, SEO builds an asset. Comparing them over a single month is meaningless — model 12 and 24 months.
• The cost-per-lead crossover typically arrives somewhere between month eight and month fourteen of organic work.
• The working ratio shifts with stage: from 80/20 in favour of ads at the start to 20–30% ads after the first year.
• If the site converts below 1%, both channels waste money equally — fix the page and the tracking first.
• The worst strategy is switching channels every three months: both compound, and every restart destroys what had accumulated.