The vampire gamepack is honestly what got me hooked on vampires in the first place. So of course I'm going with vampires. They're awesome.
Casters are cool too, but I prefer the challenge of playing with vampires. Always making sure they're indoors. Making sure they've fed. Keeping their different quirks in mind; like how some won't mind drinking from people unprompted, while others will feel extremely guilty about it so they need other ways of getting blood instead.
Plus, I don't need to worry about them dying from old age. They can hang around for generations! I could play another household for a while, with the world aging turned on, and I feel safe knowing the vampires won't be leaving me.
The whole immortality thing is just really fun in general, as I'll usually try to figure out just how old they are, their experiences, all that stuff!
Also, they can turn into bats. And they may have their own form of dark magic!
I just like them a lot.