I'm so glad to see the different definitions of "best" come to light.

In actuality, there is no "best". Only "better" in certain areas. If I were to make a list of "best", I'd have to break it down per category.
I'd take one of the later Spitfire models as an air superiority fighter.
P47M as a bomber escort.
One of the 190 models as fighter/bomber (catch all) plane. (190F-8, I do believe) This would also be a back up to the main air superiority fighter.
Ta152 as a bomber interceptor.
I see the P38 (not single engine, but same class) as too expensive and too difficult to maintain. I see the P51x as an escort fighter and the P47 is better for that, imo. The IL-2 is too slow and limited in the direct support role. Spitfire could do it all very well, only really best in range and ord capacity (not primary attributed of an air superiority fighter anyways).