770m is the better card, but also strictly for bigger laptops and eats more battery life. The 765m hits the sweet spot in preformance to battery life ratio as shown by new macbook pros.
The 770m is obviously better, and instead of explaining why, I'll let you decide if it's worth it or not. You can see all the statistics of these 2 GPUs here:
http://gpuboss.com/gpus/GeForce-GTX-770M-vs-GeForce-GTX-765M
I'm kinda in love with thin notebooks, that's the only reason that keeps me wondering and not picking the 770M one.
1 inch thick laptop? Why aren't there any like those with a GTX 770M!
770m is the better card, but also strictly for bigger laptops and eats more battery life. The 765m hits the sweet spot in preformance to battery life ratio as shown by new macbook pros.