I am a dog person, myself. I could be wrong or biased or both. But it seems to me that dogs are friendlier and more fun. They can do tricks and are nice and playful, just the way I like my furry creatures.
Also, I don't know if you've ever heard the old saying about dogs and cats, but it goes like this: "Dogs have families, cats have staffs." That sentiment pretty well sums it up for me.
Take it easy.