I think it really depends on the animal's personality. Some are nice but others aren't thou cat are for the most part independent which makes them better.
I prefer kind animals. I had a collie...he was the kindest animal ever...not a mean hair on his body. We could leave small children with him unattended...and the kids would be pulling on his ears and stuff...and he never god mad, angry, or upset. In terms of being gentle...i prefer dogs, but cats are cute. I like both I guess.