Some pro and con arguments on each team:
Pro. Peyton Manning is the best QB
in the league handsdown. Breaking Dan Marinos single season TD
record is nothing to sneeze at.
Con. The Colts are a dome team (a team who plays their home games in a domed stadium), and teams that play in domes or are from warmer cities tend to not play so well when the weather gets really chilly.
Pro. Defending Super Bowl Champs. Strung together quite a winning streak spanning the better part of two seasons.
Con. They're the defending Super Bowl Champs. That's an albatross around their neck. There have only been 7 teams that have managed back to back Super Bowl Championships, Denver being the last, so the odds are really against them repeating. They've had some injuries that have affected them and at times the team seems lost.
Both AFC games are a toss up to me, but I willing to say that the Colts will be able to hammer out a victory @ Foxboro.