Hmmm,
First off, I must have at least twenty different answers to the many variations of this question!
After giving the matter some serious thought, as a military historian, I would have to say, my favorite WW2 aircraft would be the Douglas C-47 Skytrain that hauled the beans, bullets, & bast*rds w/parachutes that made everything else possible.
I kind of surprised myself with this answer after reading so many books about the “Jugernaught” P-47 Thunderbolts and “Whistling Death” F-4U Corsairs.
I’m certain that this isn’t the sexiest answer, and a lot of people here might be groaning now, but I feel that the C-47 in doing it’s job, made more of an impact than any other aircraft in WW2 for the allies.
And remember, General George S. Patton, a serious TANK expert, said the same thing about the 2-1/2 ton truck!
I’d love to “discuss” all of the different variables included in this question. Such as Fighter, Bomber, American, German, most effective, most feared, fastest, etc., etc, etc.
“Tall Paul”