Superman vs Odin
Fight takes place under a blue sun (which increases Superman's powers even more than a yellow sun)
Odin will not destroy the star system they are fighting in.
No BFR.
Superman sundips in a yellow sun for an hour before being transported to the battleground. He gets Wonder Woman's bracers and a GL ring. He also gets to use Hercules's Mace (which has been stated to be equal to Thor's hammer). He gets one year to train with each of the 3 weapons he gets to use in this fight.
Two more stips:
1) Superman will take full advantage of his speed advantage and will be fighting at his maximum speed from the outset of the fight. (keep in mind a GL ring can also increase one's speed even more).
2) Odin gets no weapons.
Fight to the death. Who wins?