For single-seat fighters that could take punishment (a lot of it) and bring the pilot home? The P-47 stands out. There's plenty of accounts of Jugs being shot up by enemy fighters, flak, or exploding ground targets, and coming back with battle damage that would've downed any other fighter. True, those Jugs never flew again, but still, they got the pilot home.
For carrier fighters, the Zero was the bogeyman in the Pacific for two years, but then the F4U and F6F came in and did the job. The F6F produced 305 USN aces.....while the Corsair was just as deadly, having the lowest loss to enemy fighters in the Pacific (only 189 lost in air-to-air combat).
Strike aircraft: three stand out. The B-25 in gunship mode in SWPA is one: eight .50s in the nose, plus locking the top turret forward, and low-level bombing tactics made the Mitchell a formidable strike platform. Especially in the anti-shipping mission. (see the Battle of the Bismarck Sea) Two USN aircraft also stand out: the SBD Dauntless sank more Japanese ships than any other aircraft, including five carriers in 1942. Then the TBF/M Avenger, either as a torpedo plane or a bomber (Twelve VT-10 TBFs at Truk Lagoon in Feb '44 on a night strike with skip bombing sank eight ships for only one loss for an example of the latter).
Don't forget the D3A Val: the JNAF's counterpart to the Stuka. Val crews sank more Allied ships in the Pacific than any other Japanese aircraft.