Superman for the majority, imo.
Namor & Iron Man are relatively non-factors - durability's too low and I don't think they can actually contribute much offensively (ie armor could be damaged as could Namor's "wings" leaving them crippled)
Hercules might as well not be on the battle field - I doubt the booster jets or his expertise in using them would allow him to keep up with the faster/more agile fighters (plus they could be damaged, leaving him grounded)
That leaves Ms. Marvel, Vision, and Wonder Man. Against those three, give Superman an easy victory.
I see the team having two realistic chances in this fight and both seem like longshots to me:
1. Iron Man or perhaps the Vision is able to scan Superman, detect his weaknesses, and then use them against the Boy Scout
2. The team is somehow able to supercharge Ms. Marvel into her cosmic Binary form long enough for her to take done Superman
I honestly think that vision could give Supes a run for his money. He's nothing like the Martian, he use his versatility (look at his fight against surfer).
He would lose against supes but he'll leave the team with some openings while he stall supes.
This is the same guy that damaged the Juggernaut and had him on his knees screaming.