Eddie Brock won because Brock and Venom (the symbiote parasite in him) had a good physical and personality chemistry and fit well, while Cletus Kasady (Woody Harrelson) and Carnage did not, which is good, because there is a solid reason why I thought. However, I was bothered by the fact that in the middle of the film, the main character, Eddie Brock, is faced with a difficult situation and splits up after a heated argument with Venom, but before the final battle, the two reconcile without much of a clear reason. If I had to give a reason for the reconciliation, it would be that most of Eddie's people would die if they were parasitized by Venom, and the only way for Venom to win against Carnage was to make up with Eddie and let him be parasitized by him. I wanted another unique idea.