At the very least vampires are predictably unpredictable.. However what i am a bit sad about Vamps, is that i believe in an earlier edition they used to have big dude:
Vampire Lord (180k) MV6, ST5, AG4, AV9 +dodge, block, hypno, regen and no nega trait...
Holy crap. that beast eats dwarves for breakfast.
Khorne Daemons big guy:
Bloodthirster (0-1) 180k 6/5/1/9 S/GAP
Frenzy, Loner, Wild Animal, Claw, Horns, Juggernaut, Regeneration
add mighty blow at first lvl up and youre pretty much the pinnacle of killing and keeping yourself from getting killed.
Then again, as team KD is basicly full of frenzy, which can kind of get your own team totally smashed to pieces as wel. And ofcourse on ST3 players, besides the thirster.
I was really thinking about taking Khorne Demons for the league, but in the end I wasnt adventurous enough yet ;)