The Wildcat and the P-40 could hold their own against a Zero. The improved Wildcat(FM2) was effective against Zeros.
Wildcats had a 6:1 kill ratio on Zeros.
Alot of the Wildcat’s success was due to tactics, for what its worth. Thatch Weave & all.
Chennault said the P-40 was inferior to the Zero in climb rate and maneuverability. He developed tactics of diving on the Zeros. Then the P-40 could out-dive the Zero and get outta Dodge.