You will be unsurprised to learn that I selected "cats," but really, it's a very close thing. I might go so far as to say that the two groups are more alike than they are not alike, what with their astounding flexibility and their pragmatic predatory intelligence. And the cuteness, of course. 59 of the 119 participants said that a monstrous hybrid of cat and cephalopod would be cutest, for whatever its worth.
(Yes, cephalopods can be quite cute. See below.

You have to admit that's cute for a marine intertebrate that we last shared an ancestor with at least a half-billion years ago.)
(Now, to bed. I am so tired . . .)