Square Enix have stated that the Xbox 360 is easiest for them to develop for once before, so this is no surprise.
The Last Remnant developer Hiroshi Takai says that he’s rather develop on the Xbox 360 because it’s easier to work with than the PlayStation 3.
It’s been the team’s first time working with Xbox 360 and the Unreal Engine. In both cases the experience has been a positive one. In fact, as we’ve only just finished work on Last Remnant I don’t even know what my next project is going to be at Square Enix. However, I’m very much hoping it’ll be for Xbox 360 as it’s been a lot easier to work with than PlayStation 3.