While not as rugged, overall, the FG-1D (F4U-1D) was superior to the F6F in almost every aspect.
There have been some claims about F6F performance being underrated due to a flaw in its pitot.
But operationally, the F4U proved to be faster/better in almost every performance category: speed, climb, acceleration, range, etc.
The big surprise for me was the assessment that the F4U was considered easier to land with better visibility out of the cockpit.
The superiority of later versions like the F4U-4 is why the Corsair was operational throughout the Korean War, while all but the bigger, better Skyraider were retired.