The Me 262 was good plane but to expensive to produce. And the answer was ready: Meteor, Comet, Shooting Star… Even the Russian started the developed the own Mig.
My choice would go in the 1940 to the Spitfire. I like the Mosquito, but the Republic Thunderbolt was quiet good as well. 1944, Focke Wulf 190 D, and the Mustang, the Lightenning.