There can be only one choice from those available, P51 & P47
The Mustangs laminiar flow wing was the best flying wing design to come out of the war, Thunderbolts in a ground attack role were superb, 2000 HP and once the paddle blades came out, a huge jump in preformance. No cannons, but rockets were starting to replacing cannons by that time anyways.
A few other outstanding aircraft not mentioned, TA152, Typhoon, Tempest, He129, FW 190D9
Not to mention the ME 262 with the 234 Arado, the best jet combo....
The TA 152 was probably the most dangerous propeller driven opponent of the Mustang. Tempests were 24 cylinder, 3000 HP beasts, only flown by the best RAF pilots, one of the fastest propeller driven aircraft of the war...
Swamp
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