I can answer this one.
Just take a look at how Jeter does in situations X, Y and Z. Then look at how AROD does in situations X, Y and Z. Then see what categories AROD beats Jeter in. Finish by defining those categories as "clutch".
This is what the Peyton Manning, Marty Schottenheimer, and Bill Cowher (oops...forget him) bashers use.

I honestly think that Manning has had quite a few moments. In 2 of his last 3 playoff losses, he was basically mounting a late game-tying drive.
I was rooting 100% for the Pats in 2003 in the AFCC but the Colts truly got screwed on a couple of obvious, textbook no-calls for pass interference / holding, there's no denying it. (Before Pats fans get angry, I totally agree that they got hosed against the Broncos this year!)
And of course last year, Manning almost brought them all the way back in what would have been one of the greatest playoff comebacks in history.
I know, I know, almost.
You have to wonder if the Pats and Colts switched kickers how different things would be. If Vanderjagt hits the FG in the 2004 opener, do the Colts have HFA instead?
All this rambling said, I'd still want Brady over Manning (and obviously Plummer

) in any game situation.