Here is the best fighter-bomber of the war (glad to help):
P-38 could carry twice as much of a bombload . . . 8P
The P-47 was also a truly great fighter-bomber. As to which is best, the Air Force and Army would probably vote for the P-47, Navy and Marines, the F4U.
In the fighter capacity, the F4U was probably better being more maneuverable; in the bomber capacity, the P-47 could probably haul more ordnance. It was one more huge ordnance platform.