I personally think Manning is already a better QB than Brady. Although Brady is an outstanding QB and he's won so much with the Pats, a lot of their success has to be credited to Bill Belicheck. Manning's coaching was decent but not anything close to what Brady has had. Peyton's only won once, yes, but Dan Marino didn't win any superbowls and he's still considered one of the greats. When Brady got injured and was out for the season, the pats went 11-5 because of outstanding coaching. Last year, Manning was out for the entire season and look what happened, 2-14. I believe Manning is a better QB and will go down in the top 5 of all time if he wins another superbowl or not. And if he wins 2 more he could probably be arguably the best QB to ever play the game.
P.S = I'm a steeler fan so it's not like I'm saying all this cause I'm a huge broncos or colts fan.