You know there just coming now because this just got revealed late last night early this morning. Goku's new form he gets sometime during the Tournament of Power.
"The Work of Gods Ends Here !!"
Goku was made in Japan.
Superman was made in America.
America kicked Japan's ass in World War 2 and even to this day Japan considers America it's superior.
Ergo, no matter how many "forms" he gets, Superman will always beat Goku.