I've used both. I can't tell any difference between them. I run the 3COM and have the Nvidia disabled. I've brought this up a couple times and nobody has said one is better than the other.
<font color=purple>AMD XP 2200+, A7N8X Deluxe, 512mb PC3200 Corsair XMS DDR, Geforce3 Ti-500, Audigy Platinum, TDK 48x CDRW, Lite-On 16x DVD, XP Pro SP1, and more neon than a ghetto sled </font color=purple>