now, I haven't actually gotten around to trying grey goose or ciroc, but those are on my "list of stuff to try" =) Largely the grey goose I've been avoiding due to cost reasons...specifically that it's expensive as hell.
But, I have tried a variety of other brands, absolut, skyy(ugh), several varieties of stoli(ah, stoli), smirnoff, etc. and stoli is currently my voka of choice...Oranj is pretty good, and straight stoli is pretty damn good too.
It's far smoother than any other brand I've had so far, and actually russian to boot =P And the best part is that it's unbelievably cheap at the duty free shops...hmm I must go to canada again soon lol