No such thing exists. There are plenty of "best" tactics. But it depends on many factors. Look through the tactic threads in this forum and test out a few that you like. That is the only way you are going to find your answer. Also, you do realize that every tactic works differently for every team, right? So, your questions really can't be answered. You have to test out different tactics to find what best fits your team and/or your preference.