I would think that you could since that both the werewolves and vampires could think the "sun is their enemy".
So has anyone heard, if you want to block out the sun, if you can keep your werewolf powers? I don't want to side with the Dawnguard (I will on a different save, but on my main I will side with the vampires) and I have always preferred werewolves in Elder Scrolls over vampires.
The new Vampire Lord does look great, but it still boils down to player preferance.
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Edit- I know the topic's title has a typo, accidentally typed the letter "p" instead of "o".
