Both.

Vampires hands down. I mean come on they are ageless! And they can still use magic. I do like both but still if i had to pick just one it would be vamps.

I think both but wit alot of varience. Vampirism and it's corrosponding powers should change depending on which race you are or which race/tribe you got it off. I hated the fact that within OB all te vamps were the same despite the lore that depending on the race of the vamp in question the appearence and powers differ. Werecreatures as well. Have a range of them. And the longer you are one the more you are able to control the power. This should be made harder by dedicated vamp/were hunting guilds who get suspiscious of you if you are one. None of this joining the order of virtuous blood despite being a vampire nonsense.