Which is more powerful and better between 8800GT and 9800GT?

I am planning on buying a Geforce Graphic card and i don't know which one to buy. Some says that the 9800GT have some compatibility issues with games and on the other hand we have the very popular 8800GT. but the 9800GT is newer, so which one should i get? I don't like to check the statistical values & performance about those cards on the nvidia site coz they praise all of there products, i want genuine info from users who use(d) those cards. thx