Their perimeter defense is terrible, even with 3-2 defense. as long as you can stop his outside shooting, you should be able to win against him no matter what offense you run. However, since his inside defense is better than his outside defense, I'd stick with a balanced or even outside offensive approach.
It might be worth it to try a slow-paced offense against him, as you'll probably get better looks on average against his weak defense, so you'll beat him more efficiently. Patient or Low Post offense would be good, or Motion for the outside attack.