My opinion:

I have owned dogs and cats. My love for both is deep and totally committed, but also DIFFERENT. My interaction with dogs and cats happens at different emotional and physical levels.

Not to say I prefer one over the other - merely that I connect with them in defferent ways, and thus get different rewards out of the relationship.

BUT you have to agree - the best feeling in the world is turning your key in the front door after a LOOOONG day, and having your best friend rush up to greet you - cat or dog - the thrill is the same!