We don't know anything about this game yet for the console versions. The 360 version will likely be on two discs, one for singe player and the other for multi. With the option to install the second disc so you can run the game using only one disc. Halo 4 works like that.
That said, the ps3 version of the game, as Ash said, is looking good.
Seems to me, you should wait for reviews to pick which game you want if you're talking about overall performance. It's too early to discuss this and anyone who tells you otherwise is just being a stupid console warrior who shouldn't be taken seriously.
Wiseman say, forgiveness is divine, but never pay full price for late pizza.