Superboy prime v.s Mephisto

Who'd win this battle

tough one i think superboy would punch off his head, rip off his arm orheat vision him in half

where does it take place

Mephisto would lose.

Mephisto 10/10. Mephisto is beyond (permanent) conventional harm. Add in major magical powers and Superboy's going to end up spending eternity in Mephisto's hell.

bright sunny day in california

so in some sense superboy has got h home field advantage