I would pick the ps3 version for a few reasons (and I own both a 360 and ps3):
A) The ps3 is much less likely to need a trip to the warranty store. I'm sorry, but RROD is always a fear for me anytime I turn on my 360.
B) The ps3 has a blu-ray player and is an outstanding DVD player
C) It's now $299. No reason not to buy a ps3 now.
D) The ps3 online guys. Yes the 360 guys play the game just as much - but the ps3 online guys are the personality of the VSN Madden community. The 360 guys look at their friend list, challenge a guy ... and that's it. Boring. The Ps3 guys bash each other, run tourneys, have good leagues, etc...