Go with the system that more of your friends have. Or at least the friends that are fun to play games with. Assuming you're going to be playing multiplayer, it's a ton more fun in groups/with people you know than playing alone. It's also nice to be able to trade games with friends if you don't want to drop 70 bucks for a game that could potentially suck. With blu-ray and the exclusive titles I would go with the PS3. Halo is gay.