I like both actually. I like to have a cat and a dog. Right now I only have a cat though. My dog died last year unfortuneatly. I can't wait till I get my own house and yard in the future so I can get a new dog. A dog just wouldn't be feasible in an apartment.
I voted dog, I don't like cats, they alwasy seem to hurt me somehow, I've been bitten, and scratched by cats and neither of those is any fun, while I've never had a dog bite me or hurt me in any way other than them stepping on my feet.