I'd say Basara. He is the hero pilot of M7. He freaking sings, plays the guitar and is able to avoid being shot down during battle. If he was using live ammo, he'd destroy the enemy fleet by himself. Who else can multi-task like him?
Also we've never seen Guld pilot anything else besides the high tech 21. Granted that he was chosen to be the pilot of the 21 because he's good, I'm sure that gave him a huge advantage.