That's what I was trying to get at in his original post. To many variables to really say it'll always go one way, so it won't. You have the specific specimens attitude to take into account, sizes, who's being introduced to who's territory, tank
Size, cover or not etc
Obviously there’s many factors like individual fish,size, hunger, etc but there’s general characteristics for each fish. In an ideal situation there wouldn’t be any advantages like who was in the tank first but a fair scenario.