there are slight production differences but overall nvidia ones are just $hit,, not the $hit, but $hit.
from my recent cards, this is what i'd say is my ranking of 2d quality which were tested on either a vs19sn kds before it broke or my newer kds av195tf.
g400 32mb/ 16mb and radeon LE tied for first, really the LE looks just as good
voodoo4 4500
voodoo5 5500, wasnt quite as good as the 4500 in my opinion, but it was barely different
geforce v6800 ddr asus 32mb
v7700 32mb and v6800 64mb , oddly these were good amount worse than the 32mb ones, i had multiple v6800 32mb and 64mb so i tested a bunch
elsa erazor x , just not very good at all
creative labs geforce2 gts, by far the worst 2d i've seen in a while, worse than my 4mb pci matrox was.