There are different sorts of smarts.
Tiny probably has a lower kitty IQ than Baby; he can't figure out mechanisms, open things, solve puzzles, etc., as well as she can. However, he's much better at hunting--he can bring down anything; he has an amazing amount of patience. Baby just kind of runs after things with reckless, kitten-like abandon--but when it comes to figuring out how to get into the cat food box, the cupboards, or any other space, Baby is amazing. She has fast paws, too, and is wonderful at manipulating objects. She has been known to drag the spoon out of a bowl of mashed potatoes and run away with it to lick off the potatoes... that takes quite a bit of cunning, since she was grabbing onto the end of the spoon that didn't have potatoes on it, knowing that the other end did, and would come with the end she was holding...
Given that Tiny survived (I think) six months on his own in the 'wild', and Baby was skinny from just a few months of neglect as an indoor/outdoor cat, Tiny is definitely the better predator of the two. He's wary, cautious, observant... but Baby has more of a human-style intelligence.
I don't think it has much to do with their genders, though. Cats are just individuals.