I don't really prefer one over the other, but I guess I'd prefer great ass/flat chest over great tits/no ass. However, if a girl has both a great ass and nice tits, I think I'd like the tits more.
In the end, it's the whole picture that's important to me. When I see an attractive girl, there usually isn't one specific feature that catches my eye. I just see a girl and I think she's attractive based on her entire figure.
