Kinect and Xtion are equivalent really, the kinect sdk drivers seem better to me than openni… They’re great for tracking as many of the tricky things with 2d tracking are taken care of, ie lighting background subtraction etc, but sometimes 2d will do, cheap end, pseye are ok once hacked, or imaging source, or basler cameras for higher end, depends on what your trying to do, on what budget!
I love the hand tracking with the kinect, really easy to use…