Maybe Kinect will sell better, maybe Move will, but reasoning about this as if they are fighting each other is a badly stated problem, as Kinect is actually attacking Wii Balance Board or trying to find a part of the market where BB isn't the ideal controller, and Move is trying almost the same with WiiMote and WM Plus. And so it's also not only matter of the size of the potential market, but it must also be taken int account Nintendo's reaction, that will depend on how much its business could be damaged by either of them.