Well, if it was a regular vampire vs. regular werewolf, then the werewolf would definitely win. They have claws, teeth, brute strength and endurance. Vamps would get shredded to pieces. But if it was a Vampire Lord vs regular werewolf, then it would be a more even fight. I'd guess the Vampire Lord would come out on top, due to all the blood magic and power over death. I'm hoping that Bethesda will eventually release a werewolf DLC, maybe one that adds a more powerful version of werewolves like they did with vampires. Maybe it'll be a Werewolf Alpha or Packleader, one that can summon other werewolves and have power over the beasts.