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I've been playing videogames for 30 years and tabletop RPGs for 18 or so and I can honestly say I don't think I've ever encountered an "ork". Is this like how people take the faerie spelling into stupid territory with something like fayeariey?
So yeah. I vote orc is dominant.
As far as I'm aware the big user of "orks" is Warhammer 40k, though for Warhammer they're "orcs."
There's a whole trope about this type of fantasy spelling variation: http://tvtropes.org/pmwiki/pmwiki.php/Main/PhantasySpelling
Aliased to orc.