Define ‘best’..
Move is like the Wii, but works properly. It can locate the controllers position and orientation accurately, which means it’s good for ‘augmented reality’ style stuff – putting a sword or tennis racquet in your hand, and so on.
Kinect is completely different, technically very clever, but very analog and ‘fuzzy’. Lends itself well to dancing games, fitness games and stuff like Kinectimals (which is ace). Not good for first person shooters, driving games (despite the early publicity) and so on. Oh, and you need a lot of space in your living room for it. It’s something new and ambitious but may be ahead of it’s time, and developers are still scratching their heads working out what to do with it.
For teh hardcore gamer? Move. For drunken party games? Kinect, probably, depending on what comes out.