They dont always have to be humans they can raise many things from the dead and the werewolves cant take down a vampire lord in one shot and they also cant sneak. if they could (and they should be able to) then i would go with werewolf but they cant. when an animal hunts they go for quick kills not entire fights.
If you're counting on necromancy, I'm afraid all those minions died when you became a vampire lord. You can only bring back things found on site.
And you don't have to be in sneak mode to avoid detection, unless you have NPC sense and you use the force to sense a disturbance. And thinking realistically of course a werewolf can be stealthy.
If you go by pure game mechanics then the Lord wins simply because spellcaster AI is the best in the game.