Well, Personally, I think that the XBOX KINECT is better then the IPAD because Apple Sucks. However, I think that this is an unfair comparison because you are not comparing two products of the same caliber, but two completely different products.
Eh, don't bother getting an iPad. It is an overly restricted product. If anything, get a laptop over an iPad - you can download, etc what you want. As for the XBOX Kinect, I wouldn't bother as it'd be just like the Wii - it gets old really fast.