In general I would say my cat is much easier than any dogs I've owned. Could just be him, I don't know, he's the only cat I've had. He is pretty content to do his own thing all day. I'll interact with him but he pretty quickly will decide that he's done with me and walk away... my dogs, no they don't do that lol. Depending on what we are doing they are mostly like MORE MORE MORE.
I don't have to worry about him. We can be gone all day and I don't think "gee, I should get home for the cat." He's actually a very people-oriented, affectionate cat and I think he gets lonely if we're gone long periods, but there doesn't seem to be the anxiety or boredom associated with it like the dogs get. And plus he can go to the bathroom whether someone is home or not so I don't have to worry that his bladder is going to explode.
He likes attention which is easy to provide. He doesn't require all the physical stuff that most dogs do.
My rats are probably harder than the dogs and cat. They are such buttheads.