I have both consoles, and will get the PS3 version. The extra content may or may not interest me, and even if it did, I don't want to pay more money just for it. And I don't want to extend my Live Gold package anymore since it's a waste and the online community is for the most part horrible. I really wouldn't want to play GTA4 online with a bunch of 12 year old racists that enjoy swearing and being stupid.
My pokemon brings all the nerds to the yard. And they're like, "You wanna trade cards?" Damn right, I wanna trade cards. I'll trade this, but not my charizard.