i would like to be a vampire because its cool to be one and you can live forever.
Even if you didn't mean by Twilight standards of a Werewolf or a Vampire, I would still choose vampire. I would also, in a sense, be a "vegetarian" and only go after animals. (That is, if I had the will to do so) I also would choose to be a vampire, because it would mean that I was eye-catching (I don't think of myself that way, but at least my husband does... That's all that matters, even though, right now we're talking mythical creatures) I also kind of like the idea of the whole blood-sucking phenomenon thing... :)
If you mean Twilights verson of Vampires and Werewolves, I would definently be a Werewolf!!!! mostly because you get to shift into a giant wolf. How cool would that be?!