They both make crappy movies if Van Helsing or Dracula aren't involved, but for the sake of an answer it's vampires. Know why?
Because a proper vampire burns in the sun and a proper werewolf can only change under moonlight, all the vampire has to do is live until morning (preferably under an umbrella), see who the wolfy is, then look him up in the phone book and slaughter him in about a week.
__________________
|