Which search feed pays the most: Google, Bing or Yahoo?
Google generally pays the most per click because it has the largest pool of search advertisers, so more bidders compete on each keyword. Bing and Yahoo feeds usually earn less per click and return fewer ads, but can be easier to access or suit particular layouts. The best feed is the one where your traffic nets the most after deductions.
Compare feeds on RPV, not on headline RPC. A Google feed with a high RPC but strict filtering and heavy clawbacks on your traffic can net less than a yahoo feed or bing feed with a lower RPC and steadier finalisation. Coverage matters too: a feed that returns ads for only 60% of your searches earns nothing on the rest.
Rules differ as well. Google's route now requires real content and the referrerAdCreative parameter. Non-Google feeds more often allow a plain keyword lander. Many operators hold more than one feed to reduce concentration risk, sending each keyword to whichever performs better. No public league table of payouts exists, so test with your own traffic.