I say it's about 70-30, in brains favor.

Sasuke is definitely not Chuunin, in brains. In leadership, even. Instead of pursuing Gaara, he should have stayed/formed a group to take care of the invaders.

Naruto has strength, but, he's not a Chuunin. Most of the time, he's getting his ass kicked, and wins through some comeback.

Neji got emotional, and just talked forever in that match. He also gave up too quickly, since he couldn't see past his birth right.

Shino, I think would've been pretty good as a Chuunin. He led his team well during the forest/

Shikamaru didn't once panick. He was cool, and reserved the entire time, and read/predicted the opponents mind well, throughout his battle. Then, he realized what his limit was, and quit while he was ahead.