Pre-Crisis Superman vs. Omnipotus

vs.

See what Supes is dragging in the first pic?

Those are Omnipotus’ BALLS.

Thats how big a power difference there is here.
Supes is saving billions of lives by moving Onnipotus’ multiple alien BALLS.
If Omnipotus starts to itch, Supes is straight up DEAD.

There really is no Pre-Crisis Superman. Golden age, Silver and Bronze can be pretty different. And there's some serious variability in Pre-Crisis. Dude has some serious low showings, too. And if magic is involved, it's anybody's guess. Does Octopussy have any magic?

Still, with all that said, yeah. Supes FTW. Money is almost always on the 'S'.

Any version of Superman wins.