There are other obvious comparisons to be made between similar aircraft built by the british and the Americans with a view to deciding which was best.
In the ground attack role one could obvously compare the P47 Thunderbolt to the Hawker Typhoon.
But neither the Thunderbolt nor the Typhoon was conceived as a ground attack Aircraft.
Both were air superiority fighters, and the Thunderbolt was excellent in this role. Unforfunately for those trying to defend British Aircraft, the Typhoon was pretty disaterous as a fighter, and it took The Hawker companies next aircraft , The Tempest to come up with an excellent fighter.
Never conceived as a ground attack Aircraft it took a Maverick RAF pilot, to keep pestering his superiors to let him take his typhoons on a Rhubarb mission to see what they could acheive. It took many requests before permission was granted, but that Pilot saw what the Air Ministry couldn't, that the Typhoon was a truly excellent, stable gun platform, ideal for attcking ground formations and armoured columns, or simply targets of opportunity.
Since the P47 was an excellent Fighter and Ground attack, but the Typhoon was only excellent in this one role, I would argue the P47 was a far better aircaft.
( Is anyone going to argue the Typhoon (Eurofighter) verses the Mirage, which is better debate?)