Generally for laptops you'll want to go with the one that has the more powerful GPU. That's assuming the CPU is not woefully slow like pairing up an AMD E-450 and a nVidia GT 650m, but no way in hell is a company going to be stupid enough to offer a laptop like that.
In basic performance terms the GT 540m and GT 630m are more or less equal in performance. The GT 650m is basically the equivalent (or slightly faster) to the GT 560m.
If you are trying to decide between a fast quad core CPU and somewhat slow GPU compared to a dual core CPU and a faster GPU, then the latter choice will give you better gaming performance.