P-51 (based on service length -Last flown by dominican Rep in the late '80s, actually fought in the "Soccer Wars" btwn El Salvador and Nicaragua, knocking down "newer" F4U Corsairs, and a few P-47s). Based on its use, the Mustang, ala "Run-stang" had an awesome 20:1 kill ratio and flew against the best that the Axis had to throw at them. As one quote had it " The P-51 won't do what a spitfire can do, but It CAN DO it OVER Germany".I believe that if the USAAF had went to 20mm guns on the P-47 and P-51 ,there would have been higher kill ratios for both acft. But the arugement falls down to this- which pilot KNOWS his Aircraft and his own abilities, VS his oppenent. Ol'Eric Hartmann would have waxed Yeager , and Preddy would have been "cold" meat in a run down with Galland. True Killers Like Gebretsky (P-47 jock) and "Back stabbers" like Dick Bong (P-38) would be a match for Galland and Hartmann, even though I think The FW-190 D was a BETTER plane than a BF 109 or ME-109 K