I hate it when this argument comes up. Last time I checked, there are 10 other guys on the field at the same time as the QB, not to mention the other 11 guys out there when the team doesn't have the ball. Crazy thought, but those guys influence the outcome of the game too. Of all the mainstream team sports here in the US, I'd have to say football is the biggest team sport. I know I phrased that poorly, but what I'm saying is that an idividual performance will have a greater impact in baseball, hockey or basketball than it does in football.
I believe that Manning is the better quarterback. Brady plays on a better team with a better system.