In the Pacific, the rugged Corsair needed the changes that the RAF did to theirs before it became a good carrier fighter. The biggest things that the RAF did was shorten the wings by 8 inches, raise the pilots seat 7 inches and added a hood similiar to the Malcolm Hood for the Spits.
The Corsair had the potential to be a better carrier fighter than the Hellcat but it didn't start enjoying that role until 1944 which, at that time, the Marines didn't have their Corsairs directly assigned to any Carriers. Plus, the Hellcats ended up outnumbering the Corsairs so the numbers are a bit jumbled when combat rates are figured in.