The originals! No debate there! They are indestructible unless killed by its respective weapon the white oak stake

I know it’s not in the poll, but I’d have to go with the Higher Vampires from The Witcher. They can only be killed by other Higher Vampires, which is highly outlawed. So other than other Higher Vampires, they can never be truly killed. And they look really cool, possessing three forms; their human form, part human/vampire form, and full fledged vampire form.

Human/Vampire form -

Full fledged Vampire form -

If Alucard from Hellsing Ultimate was here I would choose him considering the whole "Blood is the Currency of Life to Silver plate of the Soul". As he drinks all their blood he gains like +1 to his Life and not to mention their memories and powers are also go with it.