the vampire species from most aggressive to least:

Beastfang Vampires
Bloodsmith Vampires
Plaguebringer Vampires
Shadowborne Vampires
Mindbender Vampires (since they can only cause psychological, mental and emotional damage, not physical)
Ancient Warden Vampires (they can only drain one physically through casting spells)
Nightsinger Vampires
Sunseeker Vampires
Ethereal Vampires
Frostbite Vampires (but can and will freeze someone when threatened)
Divineborn Vampires (though they inherit powers from godly parents)