Never buy a Kinect game that has also been designed for Move or Wii. It's different with MJ Experience because Kinects is actual dancing wheras PS3 and Wii is pointing 1 arm.
But Kinect is so different and requires more research into controls to get right.
Kinect Sports shows how Virtua Tennis 4 could have been with controls if it was an exclusive.
Why make for Move? No1 will buy it.