I can't comment on the Nikon, but I have owned numerous Leupolds (including a VX-III) and also a few Zeiss Conquests. They're both nice scopes. But if push came to shove, I'd buy another Zeiss Conquest. It has superior optics, a nice crisp etched reticle, true fast focus adjustmentand in my experience it's very durable.

Northernforest, you need to educate yourself on what an adjustable objective is for because you evidently don't know.