The difference is that if you go to Bestbuy.com or Gamestop.com you see that Kinect and Xbox 360 are at the top of the sales charts while Move and PS3 are not:
http://www.bestbuy.com/site/olstemplatemapper.jsp?id=pcat17080&type=page&nrp=50&cp=1&sc=gameToySP&sp=-bestsellingsort
http://www.gamestop.com/browse/search.aspx?N=0&loc=homebestall