I think I like them equally though, over the years, we've had cats more than dogs. As already mentioned cats are far less demanding of one's time: no need to take them for a walk every day; no need to clean up their mess. Also, they generally don't need so many Vet visits, they keep better health.
Dog's show their love. They often run to welcome you. They love your company. But they can want too much of you at times. Cats, on the other hand, hang around but don't generally insist on being right there with you all the time. They're happy to give you space and want you to do the same - unless THEY feel like socializing.
It is said that one owns a dog but that cats have staff. Certainly many of them have a certain regal automony. It's easy to see how they were 'placed on immaginary pedestals' in some ancient civilizations.
On occasion my family and I have owned both a cat and a dog at the same time. If brought up from kitten and pup together you find they really love one another. I recall situation where one female cat grew to be larger than the little dog. It mothered that dog, washing it, cuddling up in the same basket in the cold weather. At that time it was the little dog which caused all the angst around the place, not the cat.
As far as fondness for either one or the other I'd say I like them equally. But for convenience of ownership a cat is the way to go.