Those two boards only support the 100-133 fsb Athlon XP's. The highest they should go to is Athlon XP 2600+ (133 fsb)
They are about equal.
Nforce has integrated GPU (1 less worry about compatability)
5.1 sound and can be decoded to a REAL 5.1 speaker set up.
Better PCI latency (lower) than VIA's KT266A southbridge offers
It CAN be OVERCLOCKED to 166 FSB with PC3200 DDR RAM, just be careful
Dual Channel memory (thats arguable, but they made it that way, so I'm not complaining)