I talked to my buddy the other day about this fight and he and I didnt agree on it. I think Surfer would win and he thinks Superman will win. These are his arguments.
The energy absortion theory: I told him all Surfer has to do is just drain his solar power he said that in order for Surfer to do that he would have to physically touch him to do that. Then he said that Superman is too strong for Surfer to get that close too and try to hold him while he drains his solar power and will rip his arms off and beat him to death with them in the process. Bascially he said that Surfer has to come in contact with the energy he absorbs.
Then there is the red sunlight or kryptonite rays he could shoot at Superman: His arguments here were that the Superman is too fast to be hit by such and attack and will not allow it to happen granted Surfer is faster but he said that Superman is fast enough to avoid such a attack. Although those would be his only chances.
Again these are not my opinions but they are something to think about but I still think Surfer wins.