Meh, i use both programs. Gimp Accells in some aspects in which PS does not, but since i got PS i mainly use it, i use gimp for the script-fu's and to render (cause PS paths sucks) and i use it for competitions on Gimpdome
i used gimp before i got ps, and ps is way better for sigs and other stuff. but i still use gimp for rendering :/
Money does count. PS is much better but if you're not going ----- and/or can't afford, GIMP should be good enough for you.
Photoshop is definately the better program but it's also $600 while The GIMP is free. I definately prefer the GIMP but that's just me personally. (I've used the PS Trial before)