It depends on the situation. If you're the one making the decision, then it's a benevolent dictatorship—you're the one who breaks the tie. You might say, "Listen, I hear you, but I really think it's going to be this, and that is the decision." If you're working with an equal, go back to the argument and try to understand the other person. Sometimes, it's not a win or lose situation, and you have to come up with some sort of agreement.