As to the Spitfire being better than the P-51D... no... no...
Which mark of spitfire the mk1 or the mk 16 or the mk21???
As i`ve not flown either aircraft, i can only presume you have and can make a comparison like that??
Its got nothing to do with National pride, as far i as i know no RAF sqn used Mustang D`s, only PAF and RCAF used Mk3s.
I thought the question was , who can beat the mustang??
In Korea the F-51 Mustang was the most shot down aircraft, normally by accurate rifle fire.
With any mid to late war aspect, it would not just be down to aircraft, but down to pilot skill, training and fatigue.
After all it was the RAF Regt and not a pilot that shot down the first ME 262.
I`ve seen the pilot logs of Finnish Me109 pilots verses Soviet Hurricane pilots, would be interested to know if any Postwar Spitfire (Israeli etc) pilot shot down a foriegn supplied P51d.
Matt