I don't like this whole motion controller thing, but if I had to pick one, Kinect. IT is the only proper full motion controller, I want to be the controller if I'm running about like a idiot rather than have to hold one
Ive only tried it on the Wii and it was quite good,not tried it on the PS3 or 360 but my vote goes to the Wii because it already has it all built in and its not something extra you have to fork out for.