Um, I guess you haven't heard about what the PS3 version will do that the 360 will not.
Microsoft REQUIRES that companies charge for DLC, whereas the PS3 version doesn't have said requirement.
Microsoft REQUIRES any patches to be approved before going live, so any patches for 360 will come through MUCH LATER than the PS3/PC/Mac versions.
Steamworks allows you to play cross platform with PC users, and the PC user community is generally filled with older, smarter, more mature players as opposed to the idiot 14 year olds on XBL.
Also, Steamworks allows PS3 users to download user made maps and a whole lot of user generated content.
I own all three consoles and a Mac I game on, and the PS3 version is CLEARLY superior.







