It depends but I would choose the Kinect.
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Yes, the original Wii games can be played by using a Wii Motion Plus Remote
u don't have to but it makes it 10 times better because with the regular wii remote it does not move accurately as planned
no you dont only if you want to
No, you cannot use an Xbox to play Wii games.Also, you cannot use the Kinect for the Nintendo Wii either.
You just need one Wii Motion Plus for Wii Sports Resort. If you want to play on a 2 to 4 player mode, you need 2 to 4 motion plus depending on the number of people playing at the same time. Anyways, this game is fun, go buy it! :D