I have the 4-12x50BT and 3.5-18x44BT as well as several 4.5-14x44 Conquest. For me, it's much easier to range and spin the BT to the proper setting vs looking at a cheat sheet for MOA dope. Now, a ballistic dial on the Zeiss would even the field. It would come down to which weight and how much $ I wanted to spend when all 3 are equiped with BTs.