I'll try and see what I can remember and dig up quickly.
In order of most powerful to least powerful.
GPU ------------- Pixel/Texel Fillrate -- RAM -- Memory Bandiwdth
Geforce2 Ti ----- 1000Mpps/2000Mtps, 64MB, 6.4GBps
Geforce2 GTS --- 800Mpps/1600Mtps, 32/64MB, 5.3GBps
Voodoo5 5500 --- 667Mpps/667Mtps, 64MB***, 5.3GBps
Geforce2 MX400 - 400Mpps/800Mtps, 32/64MB, 2.7GBps
Geforce2 MX ----- 350Mpps/700Mtps, 32/64MB, 2.7GBps
Voodoo4 4500 --- 333Mpps/333Mtps, 32MB, 3.2GBps
Geforce2 MX200 - 350Mpps/700Mtps, 32MB, 1.3GBps
***The Voodoo5 5500 had 64MB of onboard memory, but due to the way it handled graphics, data was doubled, so effectively, it only had 32MB.
All Nvidia Cards here support Hardware Transform & Lighting as apposed to the 3dfx cards. This means that 3dfx cards need High CPU power to run optimally.
Anti-aliasing: The Voodoo series had a much better looking AA and too much less of a hit doing it. For AA, the Voodoo5 is better.
Voodoo3 - The Voodoo3 comes in many flavors and was never meant to compete agains the rest of the lineup. It also doesn't support 32-bit color in 3d games, only 16-bit.
Don't know much about 3d prophet.