Its pretty simple.
If you want to play madden or ncaa and use custom rosters go ps3. If you do go online there is a fairly small community here of players that play on the ps3. Although you'll have to put up with their constant rage because you can never finish a game and it lags to no end.
360 is what it is. Fairly solid all around. No custom rosters unless you do your own. Online actually works.
I'm going to go ahead and say fuck both of them. Get a decent PC.
Comes out in 2011 sometime.
/end thread.