I voted other because I want to play in a setting that the GM is passionate and knowledgable about, without being to obsessed. In my own experience I have played with a DM who had read a great deal of the FR books in a FR game, and it's great, he knows about the world and it feels rich and detailed, but I have never felt constricted by the lore. That same DM has recently started a new game in his own homebrew world, and it's great. Our intro adventure was our characters reliving the past of the world, and it was again rich and detailed, but never constrictive.
I would like to believe that I have done the same thing, first taking a long campaign through Eberron, and now developing a homebrew world.