Davy be like " I want to conquer the world "
Joyboy " I want everyone to be free in this world
Imu " Fuck both of y’all "
This is probably the actual difference between Davy Jones and Joy Boy:
Jones wanted to be King, Joy Boy DOES NOT CARE about being a ruler.
King of the World = King of the Vearth = Imu "The World Itself"
King of the Pirates = King of the Ocean = Joy Boy "Sun God" who shines down on the Sea and gives the "Abyss" of the Ocean Light.
The King of the World/Vearth is limited to the land, while Joy Boy rules the seas, and can go to any land as a result.
This is shown through Imu's inability to send troops where they want via the sea, while the ocean always takes the Straw Hats/Joy Boy where they need to go.