Werewolves all the way. I don't really care for the whole ****ty bloodsuckers in leather tights/corsets thing... ain't nobody got time for that! Werewolf all the way... sheer power, ferocity, and aggression.
Between the two, I would prefer to be a vampire. I would be reluctant to give up garlic, but I would have control over my actions at all times without altering my mindset, and I could fly around as a bat.
Vampires seem fun. I mean sure there's the weakness to sunlight and garlic but at least you're mostly sane. That is until you get thirsty for blood but at least you can get some blood from people (who are willing of course).