Because MS helped SE out with funding. Why should the game come out on other platforms if MS had to help the Devs financially? Atleast it is coming out on other platforms unlike the moneyhatted SFV which Sony was supposedly help develope which i call BS on.
Anyway TR is a game worth playing regardless of platform.
Based on what?
OT: Good for Tomb Raider. From what everyone says, it's a fantastic game and I'm glad more people get to play it. I'll probably have to wait until 2017 to play it though.