Okay, how's about we only use Pre-Crisis (most powerful) Superman? The one dragging 12+ planets in that picture I put up earlier.
Plus, Goku would fight Superman at his strongest. Heck, he gave Frieza, an evil tyrant that destroyed Goku's HOME PLANET, enough energy to evacuate himself safely from an exploding planet.
Besides, using kryptonite is unfair. You're welcome to pose the option of Goku using kryptonite. I just said that it wasn't allowed because I assumed that any self-respecting Goku fan would rather have Goku win by his own merits than leave his victory open to question because he used a cheap tactic.

Once again, go ahead and allow Goku to use kryptonite, but is that really how you want such a battle to go?
I was operating under Death Battle rules, in which all characterization is intact, except for things like Batman's/Superman's "no killing" rule.