I have never had materials to really run a Greyhawk campaign, certainly not like I've had Forgotten Realms materials or any of half a dozen other settings so I've never REALLY run Greyhawk. I did, once, perhaps 15 years ago, have the remnants of the original Greyhawk boxed set with a few booklets and the maps. I had no interest in Greyhawk at the time and it was all old, used 1E stuff. I think I sold it along with several boxes of other stuff I wasn't using (and some of which I still curse myself for parting with - like Greyhawk).
What I'm saying is that I don't REALLY know what Greyhawk is like since I've never really run a Greyhawk campaign so much as a campaign with a lot of Greyhawk STUFF folded into it. Consequently I can't select half of the options. I've never run Eberron and I've sworn a solemn oath to never run Forgotten Realms again (which I MIGHT nonetheless break if I like what 4E does to the place.) My response, therefore, is "other". "Other", in more specific terms is currently Wilderlands, which knows nothing like a "canon", and will brook nothing so insulting to its founding premise as trying to live by such.