I don't necessarily mind animal girl and monster girl is actually pretty interesting, but regular girls work just fine thanks. I really am just a simple pervert.
I want to say both monster and animal girls but there are some monsters I don't think I could handle. I will still accept all types of girls in manga and anime!
Most people said it right: All of them are great and need love. But if I had to choose one, then i guess it would have to be regular girls... just cause there is a surplus of every personality.