Forum rules allow for basic knowledge of combatants (common knowledge of the character's homeworld). In the DCU, and on DC Earth in particular, it's common knowledge that Superman (and all Kryptonians) receive their power by sunlight, and are depowered by kryptonite and red sunlight. Superman's in universe character history has that information being published in the Daily Planet, as well as the U.S. government, Star Labs, and several other organizations knowing about it because of Superman's relationship with the planet's governments. So tactics involving Superman's power source, either amping or negating, are fair game per rule because that knowledge is public per DC canon history.
Taking that into account, yeah, I could see Surfer super-charging Supes on sunlight. I could also see Hal blasting Mjolnir to amplify the blast (though Mjolnir's abilities aren't as well known on Marvel Earth as Superman's history and Kryptonian lineage are on DC Earth).
I think Team 2 wins, personally. If Superman goes after Hal I think Surfer can hold his own or beat Thor in time for Superman to join him, and I also think Surfer would beat Hal. If the teams don't pair off and fight solo and work in conjunction together instead the odds of a split increase because Thor and Hal together could pull off some pretty miraculous effects with their powers.