From Oldman:
"P-47, no question about it. It was the plane that won the air war in Europe."
When the P47 entered the fray, the air war in Europe had been going on for almost 4 years. The Germans had lost their edge, - the first time they met an organized and up to date airforce (only half their size or so though) they lost, and after that things just got worse for the LW.
When the Jug entered the fray, the LW had also been fighting more than a year on the eastern front, - loosing their ground gradually, for the masses of Russian planes were way beyond the potency of the former mighty Luftwaffe.
If any plane was to be credited for winning the air war in Europe, I'd put my money on the Spitfire. It was there when the tide shifted, - it had been there for 3 years and the LW had fallen back in that time.
Were it a bomber, the Lancaster might be a candidate, - after all, the RAF dropped more bombs on Germany than the USAAF....