The Asus is probably one of the most feature rich Geforce DDR cards, while the Creative is very bare bones (it doesn't even have TV out). Obviously, the Asus is also a lot more expensive. Whether or not the extra features are worth it is up to you. You can count on performance being very similar.
BP6, C-366/550 (x2 very soon), 320meg
CL TNT2U 180/230
BP6, P3-700@770 (for now), 320mb, eVGA MX Plus (dual CRT), waiting for VIVO module
Well, the v6800 pure and annihilator pro both are very similar. No TV-out supported in either; very basic boards. However, the asus board is supposed to be better than the annihilator board. The annihilator is based on the nvidia's reference board, whereas the asus board has been significantly altered to increase performance. If you plan to overclock, you can count on the asus board having higher capabilities.
I'm quite happy with my CL Annihilator Pro DDR. One of the reasons I picked it is because I didn't want to pay for features I neither needed nor wanted.
As for overclocking, my Annihilator Pro will run just fine on a 95MHz AGP bus!!
That's as high as I have tried, so I don't know how far it will actually go... since there is no way my other components will ever be able to handle near a 150+ MHz FSB, the CL Annihilator Pro is guaranteed to be able to overclock well beyond the rest of my system anyway, so that's not an issue.
Unless you need the extra features, the CL is the best deal I think.
I got the Creative Ge-Force pro DDR as well since i see no use for cheapo add on features and Creative users can download the Unified Glide emulators. It ended up being 50 dollars cheaper than the Asus one in Australia so i thought it was the best deal.
I actually never said significantly faster. I said faster, due to a significantly altered board design. I can't actually remember where I read the reviews. But I remember several sites benchmarking the asus ddr and sdr boards, and attributing better performance to the board design.