For me I prefer dogs, but that is basically because I've mostly grown up around them. I don't mind cats, and I agree that not all are lazy, but dogs just seem to catch my attention more. Plus, having it go around with me on a leash for the most is fun rather than carrying it along through a portable cage.
Dogs to me are a lot of fun to be around, and when I might have a sudden scarce I know I'll have my pal right next to me for protection.