I've always considered the Saints one of my favorite non-Patriots teams since they stuck it to Peyton, but I think Brees has also become Peyton lately with all the record celebration stuff so it's harder to root for them now. Plus, I always find myself rooting for the underdog in games not involving the Pats.
Guess the only thing I'll be rooting for is a good game. The more favorable matchup for the Pats (which may not even matter) is New Orleans. Both teams can be beaten and both teams can dominate.
As for the outcome of the game itself, I expect the Rams to put up a much stronger fight this time and both defenses to play better. Something like 23-20 LA.