Is it better to buy i5700 or i7500?

i wanted to know which among i5700 and i7500 is a better mobile.i like playing a lot of games and i'm a web user and i want the battery to last long while using wifi(atleast 5 hours).sre there good games on the android store?(both accelerometer and touch).does it support good games.please give me links where i can learn more about these games.i'm a gaming freak.