Seanu Reaves
The Shogun of Gaming
However, for people who randomly just become a werewolf or vampire from a chance encounter from one of the two types (like if they became a vampire because they were bitten by one randomly) never make the deal of their soul for being granted that power and thus owe no debt to the associated Daedra.
I think the act of being turned means you are given to the given Daedra. Werewolves are the Hunting Dogs of Hircine. They have no other, if you are a werewolf you are going to have your soul dragged to The Hunting Grounds by your wolf spirit.
And you really think Molag Bal, Prince of Domination... Is going to go "Oh wait... This vampire didn't actually sign a deal. I guess I will let that soul get away."
Trust me... There is a reason both are treated very seriously, and most vampires have an even bigger fear of dying.