The following are Thor's statisitcs taken from a Marvel website:
Intelligence: Above Normal (5/10)
Strength: Superhuman Class 100 (11/12)
Speed: Superhuman (6/10)
Flight Speed: Unrevealed, probably Escape Velocity (9/12)
Stamina: Godlike (9/10)
Durability: Metahuman (9/14)
Agility: Superhuman (6/7)
Reflexes: Superhuman (6/7)
The battle between these two would be a crazy one but as far as fighting intelligence goes... Thor's way of fighting is "hit it with a hammer until it falls." he never tries to come up with plans to outsmart his enemies... just throws Mjolnir at them and hopes it works. Thor would be trying to pulverize Superman with his hammer the entire time not trying to come up with a plan. Superman though would dodge him and stay a little further away, which would not be a problem since he is faster than Thor. Thor is too hot headed and he would get frustrated and become too impulsive. This would be Thor's main downfall... he would try to go punch for punch with someone who is:
1. Just as strong.
2. More invulnerable. (Thor uses his hammer to block bullets and missiles. Superman took a ground zero blast from a nuclear warhead.)
3. Faster. (Be serious now Marvel fan boys... Thor has nowhere near the mobility in air that Superman has.... How can you compare someone who reaches "Escape Velocity", with someone that approaches the speed of light?) In Superman #108 (1995)... the Trial of Superman saga... Superman chased a rocket that was going the speed of light from Earth to Krypton. He didnt catch it but he stayed with it meaning he was going pretty close or equal to the speed of light.
Now for everyone saying that Thor would be able to hurt Superman with magic... how would he know what to do? He does not have any idea what strengths and weaknesses Superman has, just like Superman wouldn't know Thor's strengths and weaknesses at first. Thor would go in swinging his hammer, trying to kick butt first, and ask questions later. It would be easier for Superman to figure out the majority of Thor's powers come from his hammer, than it will be for Thor to decide whether or not he would use a magic Thunderbolt or a regular one. In a Marvel Guidebook it says that Thor can lit well over 100 tons... it says somewhere around 150 tons. Marvel never really states it. The biggest thing Thor has moved is an island.... while Superman moved WarWorld all by himself in Action Comics #782 (yes that is Post-Crisis). Superman was trained by Mongul jr. During the training Mongul said that the only thing holding Superman's powers at lower levels is his own conciousness. Superman is said to lift somewhere around 2500 tons... large part due to his tactilekinesis.
Thor can not win. Those are the facts. How would he know "Superman is hurt by magic." He wouldn't he would go out there swinging and get knocked out. Like you all are going to side with a guy that is thousands of years old and still gets put in timeout by his pops (Odin) when he misbehaves?
The only way Thor would stand a chance is if he had the Odinpower. Thor by himself would lose... he had trouble keeping up with the Hulk's punches... and Superman is faster than the Hulk.
Thor is powerful but face facts... when a menace is threatening Marvel Earth... you dont see everyone yelling, "THIS IS A JOB FOR THOR!!!" Superman leads the Justice League into battle all the time... Thor suggests the Avengers run in and let him throw his hammer.
Superman is smarter, stronger, and faster... I provided evidence of how fast Superman is, how he is stronger, and the whole keeping cool under pressure and being a "smarter fighter" that is just common knowledge. If you all do not know that about Thor then you have no business trying to defend his side. You all keep going on the idea that Thor will somehow know all of Superman's weaknesses... in reality Thor's weaknesses will be a lot easier to notice and react on.