In this order. T2 (all metal), A.T. gold (all metal), MXT pro in relic mode, A.T. pro. I'd say that's the order running them wide open. If you run them in disc mode. T2, Mxt pro, a.t. gold, a.t. pro. Best I.D. is definitely the mxt pro, the other three are about tied probly. My favorite is the mxt for sure. Been using the gold a lot lately though. The T2 is deep and all, but I have to constantly ground balance all of them except for the whites mxt. With the proper coil, I think that mxt pro is the best all around machine of the four. And I love the back light. But it isn't water proof. I guess they all have their place.