Ok, cats are OK too. So are Guinea Pigs for that matter (they "talk" and can actually seem affectionate if you squint right)
No question cats (and Guinea Pigs) are easier than dogs.
I find dogs most rewarding, but that's just me. Obviously the effort is an issue even to me, since I am currently (sadly) dogless.
I don't know if you were in on this conversation I had with SAJ, but, If I win the Mezzetta competition, I'm buying a baby African Grey Parrot.
She/he will have a little vest and will be legally able to accompany me anywhere.