I don't know if you can say who is "better" with any significance or real meaning, as there are a ton of variables. Of course, the rest of the team matters. For example, a solid running game means you don't have to rely on passing as much, which may mean less passing yards and TDs, but maybe better efficiency and less interceptions. Also, if your team is good enough to rarely be down in the fourth quarter, it'll be difficult to rack up a ton of fourth quarter comebacks. You can obviously put quarterbacks in tiers, but it's difficult to really say that one of these true greats is definitively, absolutely better than the other. That's my $0.02.