both have benefits and drawbacks, though personally i wish they would rework the vampire active abilities as they feel super... not useful

Lycanthropy is useful for stam characters specifically if you want to be a werewolf. Vampirism is useful to all magicka toons and arguably many stamina toons. I'd say that qualifies it as more useful.

Sprint in sneak...……

For Mag character is great!

Vampirism has the benefit of being on all the time. You don't have to do anything with it to get something out of it. In fact, you get more powerful if you don't. A little backwards if you ask me, but hey, that's vampires in the Elder Scrolls. At least they don't sparkle.

Werewolves, on the other hand, are real powerhouses when transformed, and can take on pretty much anything all by themselves. But you have to give up your ultimate and you only get your buffs when transformed. Not to mention the loss of being able to cast anything but the werewolf abilities.

Werewolf is more fun. You feel like a werewolf.
Vampire is more useful in a 'set it and forget it' type thing, except in some situations where there's a lot of fire damage and you wanna adjust your level. Be nice if vampire had more useful abilities aside from using mist to cheese mechanics lol.