It's between Favre and Brady. Both led championship teams while throwing to guys like Brooks and Freeman, or Patten and Branch. Brady won three Superbowls with scrub receivers, while Favre went to one and attended another. Both were surrounded by castoffs at virtually every offensive skill position, and almost singlehandedly brought their offenses to a championship level.
If you want to bring Manning into the conversation, you're probably going to have to talk statistics. And it's hard to do that without mentioning two things - that Manning's had a better surrounding cast, and that Brady's best individual season broke the record Manning set during his best season. It's even more impressive when you note that Brady's only full season throwing to Moss and Welker with everyone healthy, was their first full season together, as opposed to Manning, who enjoyed his best season after throwing to guys like Harrison, Wayne, Clark, Edge, and others.
But if you believe that Manning's better than Brady, you'll probably talk about things like how he threw for more touchdown passes than Brady did back when he was making Troy Brown a 100 reception machine long before he'd go on to help Welker do the same.
But if that's the criteria you're using, we should be talking about Favre, not Manning, as the best QB of all time. While Manning's best season (49) is better than Favre's best season (39), Favre's second best season (38) was better than Manning's second best (33). If you want to set the cutoff at 30 TDs to make Brady's 28 TD seasons look worse, then it's worth noting that Favre has thrown for 39, 38, 35, 33, 33, 32, 32, 31, and 30 TD seasons. Manning's had 49, 33, 33, 31, and 31, with one of those 33 TD seasons being last year - when Favre also threw 33 TDs, while turning 40, and throwing less than half as many INTs (7) as Manning (16).
Favre has more career yards, TDs, and yes, INTs, than Manning. He has a longer iron man streak. He's done it with substantially worse receivers throughout his career. Favre has more regular season wins and more playoff appearances (24, 13-11) than Manning (18, 9-9). Of note, Brady has the same number of playoff appearances as Manning, in fewer years playing (18, with an incredible 14-4 record). And while Manning and Favre are both 1-1 in the Superbowl, Brady's 3-1 in the big game. And if you'd rather focus on Manning's impressive 131-61 regular season record, Brady's 97-30 regular season record absolutely shatters it.
You could probably make a case that Manning was better than Favre, and I've seen plenty of people try to make the case that Manning's better than Brady, but I'm shocked that anyone is voting for Manning when they have to put him higher than both. There's just no consistent logical argument for it.
As I said before, I'd take Manning over Favre. Comparing them for their entire careers through the 2009 season makes it closer, but it's still pretty substantially in favor of Manning IMO. Consider:Manning's honors/awards:
2003 NFL AP MVP
2003 NFL Newspaper Ent. Assoc. MVP
2003 NFL Bert Bell Award (Player of the Year)
2004 NFL AP MVP
2004 NFL PFWA MVP
2004 NFL Newspaper Ent. Assoc. MVP
2004 NFL Bert Bell Award (Player of the Year)
2004 NFL AP Offensive Player of the Year
2005 NFL Walter Payton Man of the Year
2006 NFL Super Bowl MVP
2008 NFL AP MVP
2008 NFL PFWA MVP
2009 NFL AP MVP
Total of 4 AP MVP awards
5 AP 1st team All Pro selections
3 AP 2nd team All Pro selections
10 Pro Bowls
Favre's honors/awards:
1995 NFL AP MVP
1995 NFL PFWA MVP
1995 NFL Newspaper Ent. Assoc. MVP
1995 NFL Bert Bell Award (Player of the Year)
1995 NFL AP Offensive Player of the Year
1996 NFL AP MVP
1996 NFL PFWA MVP
1996 NFL Newspaper Ent. Assoc. MVP
1996 NFL Bert Bell Award (Player of the Year)
1997 NFL AP MVP
Total of 3 AP MVP awards
3 AP 1st team All Pro selections
3 AP 2nd team All Pro selections
11 Pro Bowls
Much of the lists cancel out, leaving the bolded items as the differences. Honors/awards favors Manning even if you don't consider that Manning accumulated them in 12 seasons, compared to Favre's 19. If you do take that into consideration, it isn't as close.
In cumulative statistics, Favre has the edge, though Manning is no slouch, currently #4 in passing yards and #3 in passing TDs. And if you look at rate statistics, Manning is better across the board... he is better at QB rating, completion percentage, TD percentage, interception percentage, yards per attempt, yards per completion, sack rate, passing yards per game, and QB rating. Favre has rushed for more yards, but, perhaps surprisingly, Manning has rushed for more TDs. Manning also has the most seasons with 4000+ yards passing in NFL history, and the largest TD to interception differential in NFL history, among other records.
A huge issue in this comparison is negative plays. Favre has 317 interceptions, 159 fumbles, and 503 sacks in 285 career starts. Manning has 181 interceptions, 54 fumbles, and 215 sacks in 192 career starts. (All regular season totals, using fumbles rather than fumbles lost because that's what PFR has.) Manning gets a huge edge here.
So IMO numbers/statistics favors Manning.
As for winning, Manning's regular season winning percentage is considerably better (0.682 to 0.635). Manning is 9-9 in the postseason and 1-1 in the Super Bowl. Favre is 13-11 in the postseason and 1-1 in the Super Bowl. Overall, this category is an edge to Manning IMO.
So I have numbers/statistics, honors/awards, and winning all favoring Manning. What else is there?
As for durability, Favre obviously has a longer iron man streak, but the fact remains that Manning has never missed a game, so I see this as a push.
How about character/leadership? I don't see how Manning can be questioned in this area... he has had no off field issues, whereas Favre had the Vicodin problem and all the annoying retirement waffling. Manning is viewed as a strong leader both on the field and on the team. Favre seems like a strong leader on the field but perhaps not so much on the team... he has regularly skipped offseason workouts and training camp in recent years, and he was quoted as saying he didn't think it was his job to mentor other QBs when he was in Green Bay. I'm not saying these issues with Favre are major problems... but we're comparing two all-time greats, so it comes down to splitting hairs. And Manning also has a Walter Payton MOY award.
Comebacks and game-winning drives somewhat surprisingly favor Manning. According to PFR, both of them have 44 game winning drives, but Manning has 35 4th quarter comebacks to Favre's 30.
I agree that Manning generally had superior teammates, but I don't see that as being nearly enough to overcome all of the things cited above.
Like I said, it comes down to Manning (numbers/statistics and honors/awards) vs. Brady (postseason success). People will have different opinions on what matters more, but I don't see how any other player belongs in the discussion.