Okay, 12 posts and nobody’s caught this…
It’s Wookiee!!! There are 2 E’s people!!!
LOL, okay sorry. Regarding intelligence, the Wookiees are on par with the Klingons. Remember that Chewbacca was capable of piloting the Millenium Falcon and apparently has a fairly developed dialect, though only Han and a handful of others knew it in the movies.
Regarding brute strength, Klingons are roughly 1.5 to 2 times stronger than humans. Wookiees are twice as tall (Chewbacca was still young, if you read the books) and can rip people’s arms out of their sockets apparently with a fair amount of ease. They are also very quick, if you remember the scene from SW IV in the Death Star hangar control room, where in a lightning-quick move, Chewie knocks out an Imperial Officer.
The Klingon would possibly have one advantage, in that they are bred for war. Culturally, they learn fighting from the moment they are born, and thus likely have better reflexes and intuition than a Wookiee. However, in a match with equally skilled warriors and weapons, the Wookiee would win hands down.