Hmm, "after the war" is rather broad, but keeping it those that were flying in 1945 there are several good fighter/fighter bomber contenders that almost made it into the war:
Sea/Hornet, Vampire and Sea Fury as mentioned
Bearcat- on it's way to Japan on VJ day
P-80 Shooting Star made it to Italy and England, but did not see combat
Arguments could be made for all of the above. "Best" is subjective.