2002 (2003) Fiesta Bowl beats 2005 (2006) Rose Bowl to me. Mainly because it was Ohio State. In fact, this year's Fiesta Bowl beats this year's Rose Bowl to me, for that very reason.
However, if I try to remove the whole "It's Ohio State" thing from the games, I think that the Ohio State NC game beats this year's NC game. Ohio State was 13-point underdogs. How many people in the national media gave Ohio State no chance of winning? People thought that Ohio State didn't even deserve the "Big Ten Co-Champions" label, because, in their minds, Iowa would have wiped the field with the Buckeyes. Miami and their "Florida speed" were going to expose the Buckeyes as a terrible team with a worse beating than the year before's victory over Nebraska in the Rose Bowl. Sure, Ohio State had great defensive stats, but that was easily explained with "The Buckeyes never had to face that 'Florida speed' like they will against Miami."
This year, however, Texas averaged about 50 points a game, and had a very good defense. They were playing against the past 2 Heisman winners, but Texas had a worthy contender of their own in Vince Young. I don't think that Texas was nearly as much of an underdog as the Bucks were.
Texas won the game with 19 seconds left. USC tried a couple of plays to win, but it was a pretty good long shot. Ohio State-Miami went into two overtimes. There were something like 5 plays that could have been the last plays of the game (that's excluding all the plays at the end of regulation and in overtime that could have been turnovers, which also would have ended the game). There's the field goal by Miami to tie the game at 17 at the end of regulation. Then, of course, there's the fourth-down pass to Jenkins in overtime. The pass-interference call. Then, in the second overtime, Miami converted on a fourth-down play, and then, finally, Grant interrupted Miami's last attempt.
I think that the overall deal with Ohio State winning was a bigger game. But, of course, I may be influenced, still, by "it's Ohio State."