To compare the loyalty of cats to that of dogs is like asking which is better on the ocean: a car or a boat? The question is weighed heavily in favor of the boat, because cars just aren't made for the water.
Alright, it's nothing like that. But let's assume for a moment that this is a valid comparison.
It's much the same for cats: they're great animals and can make great companions, but where a dog wants you and you alone, a cat has other interests. They like you, but they're just as happy spending the day catching mice or playing with a ball of yarn. This in turn makes them more interesting creatures, because what the hell have they been doing all day? Cats have lives, whereas a dog lives only for you.
Remember that, my boy, and you'll go far.