Both CPUs would run any game.
The video is a trick. Desktop model numbers are not the same as laptop model numbers.
Laptop 460M = 192 CUDA Cores, 16B textures/sec
Desktop 460 1GB (not SE) = 336 CUDA Cores, 37.8B textuires/sec
See where this ends on video performance ?
But dual 460m would spank the desktop I use (gtx 260) so buy what makes sense to you. The laptop will game. For a few mins on battery. While getting very hot. With no future upgradability.