IMHO:
Superman vs Thor: Superman with great difficulty and taking advantage of his superior speed and strength.
Green Lantern vs Silver Surfer: Norrin Radd
Captain Marvel vs Gladiator: Marvel. Gladiator jobs too much.
Wonder Woman vs Beta Ray Bill: Beta Ray Bill but not easily.
Iron Man vs Martian Man-hunter: MM. Tony loses big time without intel and does a bit better with it.
Score: DC 3, Marvel 2.
I put sentry in there and the marvel team becomes way too powerful. I put Iron Man for a reason. I think Thor is slightly greater than Superman, Beta Ray Bill has advantage over Wonder Woman, Gladiator and Surfer are debatably stronger than their DC counterparts, so I had to have one 'weaker' guy on Marvel's side.