even without his speed advantage this is too close to call. supes has taken gods down before. draco, in the war of the gods mishmash that ran through wonder woman a few years back, didn't supes battle a couple different gods?
i'd give the strength edge to supes, the fighting levels don't much matter IMHO - they'll both stand there punching the crap out of each other. in a somewhat recent battle with doomsday (think the scans are in the ss v superman thread) supes is shown to be about 3 feet away from dd when dd unleashed some sort of energy weapon. we see superimposed supes as he, apparently without effort of moving from his initial position, evades the breath weapon! supes is DAMN fast, and in combat i'd give him the edge in speed. BUT . . . you cannot deny the hammer advantage. thor's lightning and god force is WICKED powerful magic and i think most times it would be too much for supes to overcome. AND while supes is supes, thor is thor . . . i'm gonna say thor 6/10, in a bloody war. i'd pay a good money to see an issue where these 2 actually went all out . . .