Not an easy question to answer.
In general, I would have to say Angelique was the hottest, especially in 1840, 1897 and when she was in modern dress. But she was perhaps most beautiful in the movie
Night of Dark Shadows. Yet she was as her sexiest when sporting fangs...!
But Maggie Evans was a very close second in Parallel Time, and Rachel Drummond had this waif-like attractiveness that made we want to see her bitten by Vampire Angelique (What? Don't tell me I'm the only one!
).
Tribute also needs paying to the Carolyn in
House of Dark Shadows with that diaphanous gown which kept hinting at so very much more than we could actually see!
Finally--and this may surprise some--Magda the Gypsy. Didn't you get the impression she'd be a tigress in bed?