Is part of this because Peyton is more charismatic than Brady? I think it has something to do with it. I'm of the opinion that they are 2 of the greatest 5 QBs of all time, and its hard to distinguish between the two, but I also agree that Peyton gets more press than Brady. I think part of the reason is his personality though. He's smart, charming, and funny. I'm not saying Brady isn't those things either, but I haven't seen it come out in him like with Peyton.
Peyton is going to make a really good studio analyst when he retires. He's got decent comedic timing (his SNL appearance was easily the best by a pro Athlete I've ever seen) and comes across as likable on camera. Brady seems like a decent guy, and is clearly way better looking than Peyton/most humans on earth, but I'm not so sure he's as good at projecting a fun personality on camera.