Originally posted by Superboy Prime
Remember Superman is sundipped. Surfer is faster than normal Supes, but this time Kal-El is sundipped and he could very well be much faster than Surfer. Not to mention stronger. He could possibly speedblitz Surfer and knock his head off.
Sundipped Superman is a planet mover. Indeed, I would not give Surfer the strength advantage--not that he couldn't amp up (especially wih Mjolner), but even if he did, Superman is more experienced in h2h.
But h2h is not likely anyway. If nothing else, Thor will have advised Surfer to stay clear.
I'm not aware of any speedfeats by SD Superman, but regular Superman seems capable of about 100 cee (eg, to the sun and back in mere seconds). SD Supes + ring is likely millions of times faster. I don't know if I would give either the speed advantage.
As to the strength of the Surfer's will: ask Mephisto what he thinks.
A big part of this battle is gonna be energy projections, and in that area Surfer excels. He has decades of experience; heck, it's in his nature to project energy.