I put neither, but not because I don't like the terms, but because I really don't care... DM, GM, Storyteller... whatever, it all amounts to the same thing, really.
use DM myself even in other games without thinking about it i know GM is more genric but just never felt right tryed useing it a few times but kept saying DM soi just stuck with it
I tend to use DM for fantasy and GM for everything else, but I'm not terribly consistent. To me, they are interchangeable. I never use anything else, though. And 'Storyteller' always struck me as unbearably pretentious.