Storyteller, all the way. Though, when I LARP, I'm totally the Actor.
Doug Douglason's quote about his campaigns being "an elaborate tapestry upon which I weave a variety of subject matter" is something that came out of my mouth, almost verbatim, back in 1999.
Sometimes I have to use sound effects (the Law and Order scene changing sound, specifically) to let my players know that I'm done with whatever plot point or exposition or NPC monologue, because they're always expecting more.