Who is Better Peyton Manning or Rex Grossman?

Keep in mind that During Manning's rookie year, 9 seasons ago, he had 28 interceptions! Grossman only had 20 interceptions in his first complete NFL season. He played only 8 games his previous 3 seasons in the league due to injury! Rex has hardly had any experience, yet he has stepped up twice in the playoffs... show more Keep in mind that During Manning's rookie year, 9 seasons ago, he had 28 interceptions!
Grossman only had 20 interceptions in his first complete NFL season. He played only 8 games his previous 3 seasons in the league due to injury!
Rex has hardly had any experience, yet he has stepped up twice in the playoffs when he needed his team to win.

So who has the potential to be better?
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