Okay, why do so many people believe Surfer will have a park in the walk when fighting Superman? Did we forget experience ? Brains ? Fighting abilities ? All this goes to Superman, end of story. Surfer has had a hard time when fighting Spider-Man, he won of course but it was a great fight. Does anybody think Superman will have the slightest problem with Spider-Man ? I doubt it.
Thanos almost beat him to death, once. I'm convinced Thanos can defeat Superman too, sure, but it will not be as easy as he did with Surfer. Thor defeated Surfer, and didn't Superman beat Thor ? Even Firelord, second rate herald, thrashed Surfer once.
Btw, I like Surfer more, but I think he's getting too much credit here. He doesn't use half the powers he has when he fights somebody.
For all these reasons I believe Superman has a good change of defeating Surfer. But vice versa also of course.