I have two teams that are a tossup
1) The Minnesota Wrecking Crew: Ole and Arn Anderson were not only brutal but deathly efficient. They would go into a match and beat you down, grab a limb, and try to tear it off of your body. They were a team that no matter who faced them they looked at that team as if they were just two more people to hurt, and they usually accomplished their goal. They mastered cutting the ring in half while keeping each other fresh. To say that these guys were dominant in professional wrestling would be a gross understatement.
2) Tully Blanchard and Arn Anderson: These two guys invented the art of manipulating the referee to being out of position. They were great in every way. They mixed brains, brawn, speed, physicality, ground and pound, all of it so damn well it was like the birth of what are now known as basic tactics that teams use today. If they weren't getting blackballed by Crockett Promotions and Tully hadn't snorted that cocain the day before his drug test in WCW they would be talked about as the greatest Tag Team of all time.