Difference is Odin is culturally significant. Shinnok is a piece of modern fiction with no relevance.

I'm talking marvel's odin, not real life vs fiction. fiction vs fiction.

Odin in marvel is based off of the true norse mythology, but is a fictional character apart from his "culturally significant" counter part.

Check out the link: en.m.wikipedia.org/wiki/Odin_(Marvel_Comics)

What makes Odin so powerful, in the marvel universe, is the fact that he uses the Odinforce. Tempered by his experience, and other traits, the Odinforce set him apart from the other asgardians. If shinnok had his amulet and Odin had had the Odinforce and his spear, who would be stronger? Would they be equal?