Idk if anyone can answer this...

Well, I've heard that vampires usually prefer o negative. I mean, they'll drink all types of blood, but o negative is like a root beer float to them. But I'm like 56% - 60% concretely sure about it. I'll look it up and paste a link or more in this answer;

Ok, I haven't found anything yet. But when I do, I'll send you the link via message. :)

For now, all I have is the o negative possibility.

it's o negative, actually.

that is a easy question to answer. The blood they look for is the strongest so they like ab- or something like that. Ab- is the rarest so they like the taste. o+ is normale so they are use to that. The nicer you are the sweeter your blood is to them. The meaner the person is the more sour your blood is to them. So if you are a ab- and you cut your self near a vampire you might want to whach your self. o- is nice to them but its like eating ice cream but ab- is like having all the ice cream in the world.. :[

I agree with answer above, you'd think the rarest of blood type would be liked the most. But like yourself I am one for asking questions, such as "Who says blood types taste different, AB, O, A, positive, negative, whose to say they don't all just taste the same?" lol. Also a possibility that things could effect taste, food for one and taking blood while victim is orgasming or under physical or emotional (eg fear) exertion could effect it also!

I dont know... maybe they don't care when they're desperte...?

I'll narrow it down to two spacific blood types. O- and O+. Either one, they like best.

i think it really depends on personal taste, such as some humans like salad and some prefer burgers. some vamps like one type and others like another. dragon_cb is partially correct, if a victim is scared or excited their body releases adreniline, making the blood taste better. juste_123 is also partially correct, if your starving you're not likely to be picky about what type you're drinking.