Who will win in a fight between Sun Wukong and Thor?
If you are talking about the mythological characters as opposed to their representations in modern media, such as Thor in the Marvel comics, then I'd say that Sun Wukong would win in a duel. Stories concerning Sun Wukong tell of how many other mythological characters have attempted to kill him, such as Ne Za and he has also escaped hell by crossing his name out of the book of death (making him basically immortal)
Meanwhile, Thor would be an intimidating foe I don't think that he would be able to stand against Sun Wukong. In Norse mythology Asgardians are known for being more along the lines of functionally immortal. Also the story of Ragnarok does tell of Thor's downfall alongside the rest of the heroes and gods of the Norse pantheon.
You could also watch the YouTube video "Smite Sun Wukong Mythology and Gods that can kill him" by NTG who concludes that only deities such as Zeus would be capable of at least subduing Sun Wukong. Although the video continues to say that Freya may have a chance as she is the only character of Norse mythology to survive Ragnarok, if you were hoping for a Norse god to defeat Sun Wukong.