AMD is better for gaming
AMD has proven itself in the gaming arena. My hubby is into gaming and drafting, so when i built our system i did some research. I found one study that paired the P4 series against the Athlon XP series. The higher Athlon XPs, 2500 and up are real winners as far as gaming and drafting software (like AutoCAD). P4s are not trash though, they out performed the AMDs on multimedia, movie making, sound editing, etc, etc, that type of stuff. So when i build a PC for a customer i always make sure i know what they are going to be doing with it the majority of the time.
Our system is 2500 Athlon XP, Gigbyte GA7 board, 1 GB DDR, GeForce4 Ti-4200-8X +DVI and runs beautifully no matter what resource hog game he is running.