There is a new payment systems directory - http://www.onlinepaysystems.info. Looks like it's still under construction but going to be pretty good service.

Its a directory of on-line payments systems. There you can find information about different systems, rate them, review, comment and discuss in the forum. There is attempt to implement the best trend technologies to get the best result. The project will be always under development and we going to improve it further based as well on our own ideas as on visitors suggestions.

I think this section here in this forum already giving a reliable information how to get the comparison and other place like talkgold forum is "crazy talk and discuss about that

You might be looking for this; http://www.onlinepaysystems.info/systems/list