Whilst im not expert at graphics hardware, if you wish to make a test of which one is better; try testing them both with futuremarks 3d mark; it has a free download here http://www.futuremark.com/download/3dmark06/ and itll give a good idea of which ones better!
I'm just fixing up and a PC wit some older compotenents and it come sdown to choice of video cards. I have an old GeForce ti4200 128DDR which has served me well over the years (surprisingly and a newer GeForce FX5500 SE 128DDR. Which card is better for gaming? I mean as much of a generation gap there is between the two cards, as I understand it the "SE" label on the FX5500 means it'a stripped down GPU, right? It seems that the ti4200 seems to out perform the FX5500 or perhaps it's just my imagination. But anyways, I'd like some of your feedback before I decide to arbitrarily slap one into the machine and screw the case tight forever.