i've been both, started with a gf2mx, then gf4, then i went ati 9200 (mistake) then a 9800se (modded to pro) then i jumped right on the bandwagon and got a 7800gt, then an 8800gts, and now the 280..
the ati cards were great, the 9800 will always be one of my all time favourite cards.. but i think i've seen the green and stayed put to be fair.
*shrug*