I need help deciding which laptop is better for gaming

Hi, I am looking to purchase a laptop, and I will use it for games as well as for school. I am not a computer guru, so I would appreciate some help with this stuff.

I am choosing between two laptops, one is a Sony i5-520M, an Intel graphics media accelerator HD.

The other is a Gateway i3-330M, with an ATI mobility 5650 HD. Both laptops have 4gb ddr3 ram.

Which laptop would be able to play the high -end games such as Crysis, Bioshock 2 or Mass Effect 2, with better graphics and framerate?

Thanks, and I would appreciate a response