I went with Xbox for the last one because they lied and said the DLC was only coming to that platform. I regretted that decision. I did recently pick up the complete edition for PS3.
I'm definitely going PS3 this time. Word is that the 360 version will be on multiple discs (probably three). Fuck that noise. And please all you Xbots, save the "Stop being lazy, changing discs a few times is no big deal." No it's not, but when I have the option to not change discs at all, I'll take it. Not to mention that this is an open world game. Chances are they will be putting sections of the game on different discs. So that means when you go from the city to teh countryside, and vice versa, you'll have to change the discs. At the very least the multiplayer will be on a separate disc. Hell, Max Payne 3 was on two disc and that game is MUCH smaller than GTA 5 will ever be.