It's still early as the game was just released but Punch Jump has a quick summary
on how Batmak Arkham Asylum
is doing on the two platforms. Right now, the PlayStation 3 version is selling more than the 360 version at Walmart, Best Buy, and Amazon. Like I said, it's still pretty damn early but it might be the sign of things to come. Me, I'm holding out for the PC version so I can add stuff like new costumes
to the game.