I think the spitfire and hurricane where the war winners, with out them the battle of Britain would of been won by Germany and the whole of Europe would of been in the hands of the Germans, then they could of focussed all their forces on Russia, and they may of been able to take even them out.
Then America would of been alone with the Germans on one side and the Japanese on the other. P-51 is a good fighter but I think the spit and the hurricane were the war winners.