Both Leupold and Zeiss should be tough, reliable scopes. The Leupold MAY receive faster repair service because it is US based, but this assumes Zeiss repair service is done overseas -- and I don't know if this is true.

What is the intended purpose of your scopes? For general purpose big game hunting, 4.5x14 is a bit powerful. The 50 mm objective on the Zeiss will raise your scope higher off your barrel and may require you to hold your cheek off the rifle stock in a strange fashion to align your eye with the scope. Also, the 50 mm objective may not fit into normal rifle cases. But you probably have a special purpose for the scope which overcomes the minor drawbacks I listed above. For general purpose big game hunting -- antelope, deer, sheep, goats, elk, moose -- it would be hard to beat the 3.5x10 magnification range. For elk and moose some might prefer a lower range of magnification. But I suspect you know all this and I'm not helping you any on this topic.

Both scopes are likely to be excellent, because these manufacturers value their reputation for quality and won't sell junk.