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Brady is a better QB than Peyton Manning his resume backs it up. Eli's Giants were 10-6 in 07 and ended up beating an 18-0 NE team in the SB that was heavily favored. Brady put up 50 TD's that season, NE was the most dominate NFL team I had ever seen. Eli outplayed Brady in the SB and was named the games MVP. Eli's Giants were 9-7 in 2011 and beat a 13-3 NE team that was riding a 10 game winning streak into the SB. Again the Giants were underdogs and again Eli outplayed Brady winning another SB MVP award.
The Giants weren't considered the better team entering either game with NE but in big games Eli has stepped and outplayed the opposing QB. The Packers were 15-1 in 2011 and were clearly a better team than the 9-7 Giants but again Eli stepped up in the playoffs and outplayed Rodgers the league MVP that year. It's not about which QB is playing for the better team it's about which QB plays the best when it's all on the line.
First...As to Peyton Manning vs. Brady...I am absolutely confident that if you give Peyton all those top 5 defenses back when he was in his prime he wins those same Superbowls that Brady does. Since Brady has become a prolific NFL QB he has exactly 0 superbowl titles.
Now Eli Manning? Oh please. First you exaggerate how good that Patriots team was in 2007. The big difference is that that team ran up the score. And if you recall that New England team peaked early with a bunch of dominant wins but in the final 6 weeks of the season they won 3 games by 3 points each.
In the Superbowl he played better than Brady (barely virtually same yardage and eli had 2 tds to Brady's 1 but he also threw a pick where Brady did not).
Brady himself was sacked 5 times in the superbowl and repeatedly harassed. That Patriots team wins comfortably if not for the other worldly great performance by that defensive line. And you want to talk about how good Eli was? Dude had 549 yards (TOTAL) in the 3 games leading up to the superbowl. Hardly fits your "QB plays the best when it's all on the line" narrative that you picked up from ESPN.