The feline. Especially, but not exclusively the housecat.
I realize that big cats are dangerous and I have not studied them extensively. I like watching them move on television. But I definitely respect them.
Housecats, on the other hand, are just great. I love how independent they are an how much they have their own personalities. I've never had two that were really alike. I love their curiosity, their snuggliness, their purring... I love that you have to earn their affection. Dogs will love you almost no matter what you do to them (not that that makes it okay to hurt them). But with cats, you are just a meal ticket unless they decide they want you to be more.