unless you are running multi monitor setup 1024MB gpu memory is more than enough, I haven't ever filled half of 1GB memory on my GTX560Ti. Take second one.
no its not important, the gt525 is faster than the gt250 even with less memory. u dont need more than 1gb and its important to have a strong cpu aswell. buying a dual core is not worth it nowdays and i would always buy a quad core system. still i wont pick laptops for gaming! u will have fun like 6 months and then it starts to overheat
I'd go for the second laptop. That 1gb less @ video memory won't hurt you at all, while the higher clock & double amount of cores of the cpu will benefit you greatly :)