Quadzilla supports 4 speaker surround sound setups, so it is considered to be a better card. (and allows them to charge more for it) I have a Turtle Beach Montego II as well as a generic Aureal card and a Diamond MX-300 and they work well in Windows 98SE. I have heard of driver difficulties in Windows 2000. The cards are dirt cheap, and a good value for the money, IMO.
Chuck