I have seen both get into fights. I had a pit bull and regularly had to break up fights. He was wonderful with people but wouldn't take another dog growling at him. He was also in a six foot chain link fenced yard. He stayed in it even when another dog was outside growling at him. Dogs would go over the fence to get to him. He would take them but if I could get out there before he got hold of them good, I could get them apart and the other would run.
I lived next door to a man who bred wolves to sell to zoos. He had a pure bloodline of Timber wolf. They would get into fights among themselves occasionally. They were fighting for dominance among themselves.
I believe that they have an equal chance of winning. It would depend on which one got the throat hold first. They both go for the throat and once they get hold the fight is over. The instinct on both is to go for the throat. The killing hold. Then they just hang on until the other one bleeds out or suffocates, depending on what part they got hold of.
Fighting dogs on purpose is a crime, both morally and legally. Don't do it.