I'm not an Indy fan, but I like Peyton. That said, I'd say he's among the top ten QB's in my life, but not the best. It's not fair to compare "best of" in sports because there are so many things to factor in.
If you go by accomplishments, he's got one ring. His brother has that many, and Peyton is a far better QB than Eli.
Joe Montana wasn't the best athlete, but as far as being a winner, the man was the best to play the position. Dan Fouts, Dan Marino, Warren Moon, Fran Tarkenton,they were all as good, but I wouldn't put them in the same class as Peyton because combined, they have no championships.
Joe has what three? With less talent. That's a god in my opinion.
ETA: It was four rings, in four tries. That's pretty godlike