I know this sounds crazy, SA Superman sneezed away a Solar System and flew so fast that he can time-travel.
However I've discovered that most people whom believe he's overall more powerful do not have a vast knowledge about Thor's capabilities. Sure he'd win in a fight because he's practically indestructible. Thor has fought beings that are more powerful than him, such as Galactus and Celestials. I assume that most people on here already know a lot about Superman's abilities during the Silver-Age but to make this a fair comparison I will mention that his greatest strength feat (that is consistent) that I've seen was holding a mini black-hole in his palms.
Superman has the speed and durability advantage
Now as for this forum, who has more powerful attacks?? and strength?
Thor's greatest strength feats:
The mass of a Neutron Star can be 4-8x greater than the sun according to physicists. This is done by Thor in his normal state of strength, his strength can amplify by 10X of its original extent by Warrior Madness as well as enhancing his strength with Odin Force to a far more incalculable amount.
Destructive power (Who has more powerful attacks):
Thor has too many more attacks than SA Superman to name, but I'll just name his most powerful. Energy absorption and projection. Thor was once capable of absorbing the energy of a Null Bomb which was powerful enough to cause an explosion to destroy an entire galaxy, meaning he could re-direct the Null Bomb energy and form the explosion to destroy an entire galaxy if he wanted but instead he directed it as a "Torrent of cosmic force":
And even energy sufficient enough to destroy one fifth of the Universe:
Thor can absorb energy and project it by 100 times of its original power:
Theoretically he could destroy the equivalent of 100 galaxies as well as 20 universes if he's capable of amplifying the energy of the Null Bomb and Life-Bomb contained in his hammer by 100.
With Odin Force Thor is able to destroy as well as create galaxies with relatively ease.
SA Superman is powerful but as for weaponry, he doesn't have a lot of abilities other than Heat-Vision and Super-Breath.