Had WWII continued, the P&W R-4360 powered Martin AM-1 Mauler may have gotten an edge over the Spad.
But was on the way out after the War, for the smaller Skyraider that had a less troubled development, and never did get developed to a -2 that (hopefully) took care of the unresolved handling problems on Essex sized deck the Mauler had. It was big.
Was nicknamed 'Awful Monster' as often as 'Able Mable, carried even more ordnance
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There are a few REALLY interesting candidates, had things run a bit longer.
My personal favorite in the "missedbythatmuch" category is the XF8B. 6x 20mm and a 6,400 pound bomb load in a single piston driven fighter (with trans-Atlantic range of 2,800 miles to boot). Think about that sort of loiter time.