I just picked up an xbox 360 this weekend and got GRAW2 for it. After playing only the pc GRAW and GRAW2 games I can say now that I like the 360 version better. Don't get me wrong, combat in the pc version is top notch, but the epic scope of the 360 version is just so much better. The story also fits the 360 version better. Now I'm going to get the original GRAW for 360 as well.
PS: I love the chopper rail shooting, it's very cool.