I sold my wii and bought an xbox kinect. Best decision i made. Kinect is so much more responsive and wayyyyyy better graphics. Kinect is hands down the alpha in the motion sense gaming word, even better than ps3move
I also just sold my wii and got kinect . Let see the wii you must use a controller the kinect your body is the controller that makes the kinect better then the wii. Plus it comes with cam and mic. built in so you can talk to kinect buddies. you can also use your voice as a controller in the kinect hub that a nice addition. I do have to say if you use it as your mic.though you sound like a robot but they are working on update the voice capability still.
Kinect has very few games atm, and i cant honestly see this kind of technology being well implemented into non "party games" such as halo, CoD, Forza ect until atleast the 3rd generation of it, which would be atleast 10 years away.