Very important question

Oh wait... the PS3 version unlocks the Steam version.

Link

Good find.

Yeah, PS3 version's the one to get since you get it for PS3 and PC/Mac. I'm going with the PC/Mac version since I don't own a PS3 and it's $10 cheaper. Also on the rate it's going the PC version might be released a day or two earlier, if that matters to anyone.

http://www.aperturescience.com/glados@home/