SHATTERING PLANETS
At best Surfer can shatter (not vaporize) planets. If a non holding back Superman can press more than 50 Earth weights then he too could easily shatter planets with a single blow.
VAPORIZING FODDER
Second, Superman can IMP. If he punches something with 99.9999999% the speed of light then not only will his mass significantly increase but the kinetic energy produced from that type of velocity would vaporize any fodder object that Surfer can vaporize. It's the same science behind of WBH'S output energy after the collision. That energy had vaporization properties due to the impact.
DAMAGING DURABLE BEINGS
If a non holding back Superman can press more than 50 Earth weights then he can damage beings that Surfer cant. Also, going by comics, OWAW Superman can literally damage beings that Surfer's blasts cant.
Bottomline: Since a non holding back Superman's punch can damage very durable beings that Surfer's blasts cant and can also vaporize any object that Surfer's blast can. Thus the punch has the better damage output.
P.S. Superman's hv has better penetration power than Surfer's blasts. It can reach temperatures more than 1000x hotter than the sun. No character in comics was shown to survive or produce that type of heat.