The short version
- These are not really alternatives. Affiliate marketing is a monetisation model; SEO is an acquisition channel. Most affiliate sites are SEO sites.
- For a business with its own product, affiliates are a distribution channel you pay for on results — low risk, low control.
- For a publisher, affiliate revenue is the easiest monetisation to start and the most exposed to algorithm and AI-summary risk.
- Thin affiliate content — reviews of products nobody has touched — has been a declining asset for years and is the most exposed of all.
The comparison as usually posed contains a category error, and it is worth naming before going further. SEO is how people arrive. Affiliate marketing is how the arrival gets converted into revenue for someone. A great many affiliate businesses acquire their audience entirely through SEO, which makes "SEO vs affiliate" roughly equivalent to "electricity vs lighting".
There are two genuinely useful questions underneath it, and they have different answers depending on which side of the transaction you are on.
The short answer
Fit for your workflow
If you have a product: affiliates are cheap distribution. If you are a publisher: affiliate revenue is fragile.
Product businesses should treat an affiliate programme as performance-priced distribution — you pay only on results, and the trade is low control over how you are represented. Publishers relying on affiliate commissions should understand that the model sits directly in the path of both algorithm updates and AI summaries, and should diversify before that becomes urgent rather than after.
- SaaS or ecommerce with a product
- Run a programme. Results-priced distribution is hard to argue with.
- Publisher living on commissions
- Keep going, but build first-party value fast — data, testing, tools.
- Starting an affiliate site today
- Only with genuine hands-on expertise. Aggregation alone no longer clears the bar.
The two sides compared
For the programme operator the main hidden cost is brand risk. Affiliates optimise for conversion, not for how accurately you are described, and some of them will bid on your brand terms or make claims you would never make. Programme terms that address both are worth writing before the programme launches rather than after an incident.
Why thin affiliate content is in structural decline
A large share of affiliate content historically consisted of reviews written by people who had never used the product, assembled from manufacturer specifications and other reviews. That worked because it satisfied a query well enough to rank, and ranking was the whole business model.
Two things have eroded it. Search engines have spent years getting better at distinguishing first-hand experience from aggregation — Google’s guidance on people-first content is explicit about it. And generative summaries do aggregation for free, instantly, which removes the value of a page whose only function was aggregating. An affiliate page that contains something nobody else has — a real test, a photograph you took, a number you measured — survives both. One that does not, does not.
Disclosure is the other obligation worth getting right, and it is a legal one in many markets rather than a courtesy. Affiliate relationships must be disclosed clearly to readers, and affiliate links should carry rel="sponsored" per Google’s guidance on qualifying outbound links. Sites that bury disclosure risk regulatory attention quite separately from anything a search engine does — see dofollow vs nofollow.
Single points of failure
A site earning all its revenue from one merchant programme, acquired entirely through one search engine, has two single points of failure it does not control. Commission rates get cut unilaterally and algorithms change without notice. Both happen regularly; neither is appealable.