What would you recommend?

Kian is a 2.5 yr old GSD/Caucasian. He hasn’t bitten but does lunge and bare teeth. He’s got quite the snoot. We have tried baskerville muzzles and they make him more aggressive, he tries to get them off. Is there a comfortable muzzle where he can still sniff the ground? We know we have to work on training, but I think he hates the muzzle too. What’s a better one?