Just Dance 3 - Kinect or Wii?

My daughter wants this game for Christmas and I'm not sure which would be the better platform to get it for. Both consoles are hooked up to the same living room TV, so its mostly just what gameplay is more fun. Dance Central was a little tough for her, but she loves Just Dance. Does anyone here have any experience with the kinect version (or can point me in the direction of a good comparison)?