That might be technically true but most shops have the 360 games about 10 pounds cheaper than PS3.
Don't know what shops you're going to but the ones I'm going to are knocking about £10 off the RRP of games on both formats, making what I said both technically and practically true.
Games available on both systems generally have a higher framerate on the 360 too. And they have rumble + better online features.
I'll have to take your word for that, since I refuse to pay Microsoft an annual fee to activate online features of a game I already paid for once. No wonder they can get away with cheaper hardware prices with so many suckers around for the Live Arcade subscription "wheeze".