Superboy(MERGED) VS King Thor(REIGNING)

Superboy- Kon El and Jon Kent

VS

King Thor- REIGNING

Superboy or Sovereign?

King Thor, probably. Particularly if Thor at all inherited Odin's telepathy along with the Odin Force, who could match minds with Galactus himself.

Kon-El/Jon Kent can be separated that way.

Thor wins.