The P-47 didn’t have speed. Better check on your stats. the 47 and Corsair had the best engine—the 18 cylinder Pratt and Whitney.
The P-47, Corsair and F6F were all powered by the magnificent Pratt and Whitney R-2800 engine--the most powerful radial engine of its day.
And all three were superlative fighter aircraft.
You’re correct about speed, I should have said climb rate. I was trying to be concise. My impression is that pilots preferred the P-51 for air combat, but the P-47 could take more punishment, which comes in handy near the ground. The A-10 borrowed the nickname Thunderbolt from the P-47 in celebration of its fantastic ground support role.