Human. Always and forever human. If/when we have site events that require us to pick a species, be it vampire, elf, werewolf or otherwise, if the human option exists, I'm going for human. The clothes and items are made for this base, and I like that sort of reliability in testing items and being confident items will look good on me.
Hmm I like being human but during Halloween I became a dark elf and made a bunch of avatars for the skin. Now I must use them.
I prefer the human skin, if only for simplicity and better arms. I do like how narrow the waist is the the dark elves because that give me a nice negative space between the arms and the waist. Before it got a bit claustrophobic.
Still, stick arms. Cute creamy avatars are harder to make too.
Storywise I like the centaurs, they are cute and like to run.
Werewolf. I always have the ears and tail. I don't like the werewolf skin from 2k11. Tried it and it just didn't look that great on my avi. I did use the pale vampire skin for a little while, but the eyes just looked a little weird, so I tried the darker one. Stuck with that base for a little bit, but then changed back.
To be frank, I have taste in skins that's more diverse then the colors of a rainbow. However, if I have to narrow it down, I'd say that it depends on my mood and right now I'm looking to get more of a mature feel. Also, I'd really like to do something that I saw years ago that looked something like this.