From what I've seen of both of them, Wii Party U has some interesting options regarding how you play the game, and some of the party modes and minigames look kind of fun, but it also has a lot of modes I don't think I would ever use.
The original Wii Party may have less content, but what it lacks in quantity I think it makes up for in quality -- all of its modes seem so much richer and more fleshed-out. In comparison, Wii Party U comes off feeling a little too lifeless and even robotic.
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