I would buy the kinect V2 but the fact thst they don’t come with a adapter was mind blowing to me. I have seen great mocap using the kinect v2 but the adapter over here is an extra £40.
I would say if you have a spare £150 to spend on a kinect v2 then go for it as it has better colour resolution and depth resolution. This helps with for example, sitting down or kicking. I would also suggest a kinect v2 if you are struggling with space, it have a more wide fov and the capture is 16:9 at 1080p 30fps. The kinect 360 is 480p at 30fps and is 4:3.