George has no idea what Elliot's cat form actually is, but he can guess.
He assumes this is incorrect, because why would someone ask this if it were true, but he doesn't know for sure.
As for the actual answer, massive physical strength isn't really Cheerleadra's thing by default, but it does come with a bunch of other perks, so... Cheerleadra definitely wins overall, but cat Elliot MIGHT be able to win a bench press contest?
Look, if it ever comes up in canon, it can get settled then.