An ad network and an affiliate program sit on opposite sides of the same transaction. The network sells you attention. The program pays you when that attention produces a result. Comparing them as alternatives is a category error, and it is a common one.
The real question is which side of the transaction you are on, and whether you should be on both.
The two roles
Buying from an ad network. You pay for impressions or clicks and take the risk. If the traffic converts, the margin is yours. If it does not, you paid anyway.
Earning from an affiliate program. You get paid on results and take no media risk. The ceiling is set by how much traffic you can generate without paying for it.
Selling to an ad network. As a publisher, you rent your audience’s attention to advertisers. Predictable, immediate, and lower value per visitor than a conversion.
Most people who last end up in more than one of these roles, which is what makes the comparison misleading.
Why the combination is the normal outcome
An affiliate with only free traffic has a ceiling set by how fast their audience grows. Adding bought traffic removes that ceiling and adds risk.
An affiliate buying traffic with no owned audience is paying for every visitor forever. Adding content and email lowers the average cost of a conversion over time.
A publisher earning only from ad networks leaves the commercial half of their traffic underpriced. Adding affiliate placements on the pages with buying intent raises revenue per visitor without more traffic.
Each combination fixes a specific weakness in the other. That is the whole argument.
Choosing a network to buy from
The criteria that matter are unglamorous. Which formats it actually has volume in. Which countries. How granular the targeting is. Whether it passes clean parameters to your tracker. What the minimum deposit is and how fast approval takes.
Formats deserve the most attention, because the format decides what kind of offer can work at all. Mondiad’s guide to what popunder advertising looks like today is a good example of how much the answer differs by format, since pop behaves nothing like a considered click.
Choosing a program to promote
Payout matters less than conversion difficulty, cookie window and how conversions are validated. A generous payout attached to a conversion your traffic will never complete earns nothing.
Recurring programs deserve a preference when everything else is equal, because the revenue accumulates instead of resetting each month.
Running both without losing track
Keep the accounting separate. Media spend is a cost with a date. Affiliate revenue is income with a delay, sometimes a long one. Netting them together in your head is how affiliates end up profitable on paper and short of cash in practice.
Track cost per conversion on the buying side and earnings per thousand visitors on the earning side. Those two numbers, watched separately, tell you which half of the setup deserves more attention.
The traffic side of this discipline is covered in push ads and affiliate marketing, and the cost side in cheap traffic and profitable traffic are not the same thing.
FAQ
Are ad networks and affiliate programs competitors? No. They are two sides of the same transaction. You buy from one and get paid by the other, and many people do both.
Can you use an ad network to promote affiliate offers? Yes, and that is the standard paid affiliate model. Check that the offer allows the traffic type before you spend anything.
Which should a beginner start with? Start by promoting one affiliate program. Add an ad network once you know the offer converts, so that you are buying traffic for something with a known result.
Do you need a website to buy traffic? Not always, though a landing page usually improves results and is required by some offers and some networks.