My dog is a gangster :P When my brother was born he was like "uh uh. This thing ain't taking my place" So he put For Sale signs up around my neighborhood :P
From my experience, dogs fit people who have time - taking care of a dog isn't that simple as it is for cats (literally just feeding and giving the cat water, maybe petting sometimes). Dogs look at you in the eyes, not at your hands. But since cats are hilarious, cute and don't bark, I'm going with cats. :3
Dogs. Not just because I am one (actually more than just one), but because I own one too. I like cats too, but 1. They just use me as a scratching post and 2. My dad is allergic to them.