Honestly, I could see this going either way. It's a stalemate of some sort. The only reason why superman might win this if at all would be a slight edge in strength, speed and durability, but the hammer evens it out though. I've seen both take on beings with more or less the exact power set of the other and do decently. I've always seen the two as being on equal footing.
Originally posted by Brockalizer
Seriously, put down the crack pipe. Superman is a Super-pussy when it comes to magic. Thor's enchanted hammer would cave in Superman's skull. Wonder Woman would be a tougher opponent for the God of Thunder.
PC supes mabey but current supes is at least average at resisting magic theses days. hes not as suseptable as the old days but it still hurts him more then most.