In an aircraft only standpoint the F6F was king in the kill stat category. However, in terms of holding the line and fighting with their back to the wall the P-40, F4F, P-38, and P-39 slowed the Japanese tidal wave moving across the Pacific.
In a more laid back outlook consider the war in the Pacific like a dodgeball tourney. Japan beat the Chinese in round 1. They beat the motley squad of the Phillipines, Okinawa, Guam, and New Guinea in round 2. They were on top of the Soviets at the intermission and looking ahead to facing the Australians in round 4. While on the way back to the arena Team Captain Tojo looks to the side of the walkway and smiles. He pokes Co-captain Yamamoto and says "Do you think I can hit that hornet nest in that tree with one shot?" Yamamoto replies "Why would you even want to hit a hornet nest?" The rest is history.