Move. I own all 3 systems and a PC and I gotta say, it doesn't seem like the kinect has very strong prospects for core gaming. Sure, you can pick up a prop and use it as a gun, but we have no idea how accurate that will really be for aiming, and I'm skeptical. Aiming aside, how will we be able to do all the other controls in an FPS? Without buttons, we'll end up looking like a retard AND taking 3-4 times as long to do the action.
And a lot of people seem to overlook that the playstation eye also tracks the body seperately of the move. So you -can- control more than just the character's arms and hands. You've got almost all of kinect's capabilities, and increased capabilities on everything that the wii offers.
Plus, game lineup: They've already converted a couple old games to be compatible with move, and have several more on the way that are in development specifically to use the move. (Hardcore games, not just casual) And those titles, plus titles not compatible with the move are being developed in 3D (not just upscaled) So, even aside from motion control capabilities, it just seems more viable to invest in the PS3 right now.