While the spit was good, the P51 was better. Also, the last model of the spit had a square wing tip not elliptical as the original had. Also spits alone couldn’t have won the Battle of Britain, without the Hurricanes they would have been SOL.
I once saw a list of victories by spitfire and Hurricanes. It turned out the Hawkers had the same victory per flight as the spitfire.
Reminds me of something Chuck Yeager said in his book. “It is the pilot that makes the difference” assuming the planes are anywhere equal.
The only time the pilots have to really show their best skills are when they are facing the enemies best. Then the winner really is the winner.