I watched all of those! And here's what I think about it.
Twilight Saga - I only love it `coz of Edward Cullen and more hot vampires.
Underworld - I'm not into the action thing, so no.
Vampire Knight - Emo much? So I don't like it.
Vampire Diaries - THE BEST!

And I think it's the original vampire romance `coz it been out since 1991 before all of the vampire fad.
Vampire Academy - Too girly.
True Blood - I think it's way too porn.
Vampire Assistant - I like the concept of the movie, it's different from all the other vampire movies.
Buffy the Vampire Slayer - It's fine, but it's so last last last year!
"Dracula" - Who doesn't love it?