I tried about four or five wiki services, and found Wikia to provide the best free offering. There are better wikis out there, but they are up to $49/month. Also, Wikia has a ton of game wikis, including WoWWiki for World of Warcraft.
I have no preference. I started one because one needed to exist. If someone else wants to drive, or move it, or whatever, that's fine. It's working fairly well where it is, though. I think the only compelling reason to move it would be if ZarkSoft was going to host one.