Hmm...
If by "witches" I can be more normal-looking like the witches in Harry Potter or something like Arche Klein (she's a Half-Elf, I know, but she rides a broom and can have "Witch" as her title) from Tales of Phantasia, then I'd be a witch. I love magic (my top favorite anime/manga, Fairy Tail, is all out magic), and it'd be nice to be known for making herbal remedies (not all witches stir up poisonous brews, you know).
However, if the witches are your typical green, wart-on-the-nose witches, then I'd rather be a werewolf. I'm thinking more of a Teen Wolf or a Scooby Doo and the Reluctant Werewolf (as well as the Scooby Doo episodes with werewolves) sort of werewolf, not like in Twilight where, if I recall, they actually turn into wolves. So what if it's a little more hair; it gives me an excuse not to shave |D