IMHO some of the WWII-winning aircraft were:
Supermarine Spitfire - probably the most famous combat aircraft in history? Total produced 20,334.
Vought F4U Corsair - first US aircraft to break 400mph; 12,571 produced between 1942-1952.
North American P51 Mustang - designed, built and flown in the space of 117 days - total produced 15,586.
Yakoviev Yak-3 - when the Normandie-Niemen group had the choice of all available US/British/Soviet fighters they opted for the Yak-3 - production of the yak-1, -3, -7 and -9 was approximately 37,000.
Avro Lancaster - could carry 22,000 lbs of bomb - total production was 7,377.
Douglas A26 Invader [later rebuilt as B26K] - served with combat units 1943-1976. A total of 1,355 A-26's were delivered.
DeHavilland 98 Mosquito
This is my own favourite and it was a jack-of-all trades, perhaps, the first multi-role combat aircraft. A total of 7,781 of all marks (nearly 50) were built in Britain, Canada and Australia.
It was used as: p-recce/nightfighter/trainer/bomber/fb/intruder/carrier-borne/strategic-recce/torpedo
and carried the mails to parts of neutral Europe.
As a bomber with just two crew it could carry as great a bomb load faster, farther and higher than some of the four-engined bombers which carried upto 11 crew members.
A great plane.