Which planes during WW2 were considered the shining stars of their country
For the US it's really hard to argue against the F4U series. The F4U-4 met or exceeded the P-51 in raw performance in most every category but range. The series in general DID out-range most P-47 variants, are often placed on equal terms with it in terms of durability, and outperformed the Jug at most altitudes below 20,000 feet. The airframe itself demonstrated the capability to SIGNIFICANTLY out-haul most single-engine propeller-driven fighter and attack planes prior to the arrival of the AD Skyraider (I've seen figures ranging anywhere from 6000-8000lbs of ordinance for the AU-1). Designed in 1938, first flown in 1940, and flew her last combat mission in 1969 (downing a Mustang, of all planes), outlasting the Hellcat in active service.
She had her teething problems, but so did the vaunted Mustang. Although certainly outperformed by later designs like the F7F and F8F, by the time they arrived the era of the piston-engine naval fighter was already drawing to a close.