How did the 16-inch/50 compare with the British 15-inch/42?

For Second World War service, how did the 16-inch/50 compare with the British 15-inch/42 in accuracy and power?

The 15-inch/42 could be very accurate, but the newer 16-inch/50 is rated as the better gun overall, with barrel-construction methods affecting performance.

A closing question compares the accuracy and power of the 16-inch/50 with Britain's 15-inch/42. The 15-inch weapon could be remarkably accurate on occasion, but the overall advantage goes to the later 16-inch/50 design. The comparison also turns on how barrels were manufactured, including built-up construction versus wire winding. The answer treats calibre alone as insufficient for judging gun performance.