Well, having played the Diablo III beta, either laptop will run it fine on medium/high settings with no issue especially at the laptop's resolution of 1366x768? I ran it on max settings on my less then stellar desktop with no issue/framerate stutter.
The D3 Beta should not be used as an indicator of how the real game will perform with hardware. The recent open beta was meant to be a load(stress) test on the servers not on client machines.
Despite this both of those laptops will play D3 but the better graphics card will surely allow for higher settings.