It's complicated- I had a lovely Black Lab who never bit or even barked at me once, but now she's gone we have our original cat as well as a ton of strays or 'cat-about-towns' who take advantage of our hospitality.
I really love dogs for their faithfulness, trainability, and pettability(?), but I love cats for their cuteness (usually), managability, and hilarity.
"Dogs are for companionship. Cats are for comedy."
-Darby Conley, creator of Get Fuzzy
(Edit: Wow, my avatar doesn't quite represent love to animals. I'm pretty sure the Combine wiped out most of them.)