Athlon any day of the week, and twice on Sunday.
I've had them both at one point between work (when I wasn't doing this fulltime), and home. Even when work would have a faster chipset, the Pentiums simply did not perform as well.
As for home, I do a lot of things on the different computers from gaming, video processing, and about anything you can imagine. For all home PC's I prefer, and have had AMD's for all computers for past 8 years. Most recent CPU's a Athlon 64, and it's blazing compared to older AMD 3200.
I say AMD is just a better all around chip IMHO.
