Both video cards are bad but the HD 6570m is better than the GT 520m, I think.
The mobile i5 chips are all dual-core with hyperthreading, so 2 cores and 4 threads. The i7's are dual or quad; the i7-2630qm is a quad. The 2630qm is clocked at 2 GHz, while the 2410m only has two cores and so can go a little faster, at 2.3 GHz. Most games only use two cores, so the two unused cores on the i7 will only be running programs in the background. In practice, I think the i7 having extra cores to run background programs on about balances with the i5 being clocked higher, so for gaming, they're about the same.
Still, neither of those laptops is really for gaming. If you would fill out the template [here] we can find you something better.