there really shouldn't be a debate.
PC > console in these FPS games.
the mouse gives you such an advantage over console controllers. those that think otherwise are just fooling themselves. this is not to say that both are not a whole lot of fun.
lets just say that if FPS online gaming allowed for mulitple platforms within the same game (ie. PS3, XBox, PC all playing together), everyone would move to PC as they wouldn't be able to compete otherwise.