PS3 is going to be superior hardware wise (and with graphics), but both systems have some great developer contracts. you can't really make a bad decision i guess.
me? im getting the Nintendo Wii above all things. their mindset is the same mindset that Atari had in 1983 and that Nintendo had with the NES in 1986.
fun gameplay>>>>>>> awesome graphics 10 times out of 10. very rarely do both meet at the same time.