So then in the Companions I can turn into a werewolf and a vampire lord? Like I can have both abilities?
I am curious about that too, it only came out 2 days ago so I'm not sure many have tried it.
I will check and I'll probably get to that part by tommorow morning if I plan on sleeping.
I wouldn't say so though, I think you won't be able to.
BUT, you can always join the Dawnguard, a werewolf is a perfect vampire hunter, even though I would reccoment VL more.