Huh ? Sounds like the differences are relatively minor.
I've sailed on Carnival and Holland America, which are suppose to be radically different. I didn't view it that way.
Food? about the same
shows? about the same. Carnival does offer R-rated comedy, but since I don't attend R rated comedy that doesn't matter.
rooms? about the same
service? both good. HAL is all Indonesian & Filipino, while Carnival staff more diverse.