> A6M Zero
Zeroes main issues in combat had a lot more to do with situation, pilot training, flying culture of IJN air arm, and technological issues. In reality, the Zero could fight toe to toe with an F6F.
Technological is radio issue, leading to difficulty co-ordinating battles.
It might not help the Japanese used a lot of hand signals in dogfights, so when the Americans increased the battle area by going faster and higher, they ran into serious issues.
Stuff like splitting up Japanese fighter groups was much easier than it's American counterpart.
Also being handicapped by weak engine tech.
Yamato best BB ever built.