Re: Zeiss VM/V or Nightforce NXS
I doubt you would be dissapointed with either choice, both are excellent. Zeiss have a long established reputation for excellent optical quality and of late have started to offer some useful reticles having added to the more traditional European types once offered.
That said the NXS scopes are rugged, offer excellent reticles and great adjustments, i think it would be hard to fault them, at the end of the day it may well come down to personal preference, kind of like trying to compare an apple to an orange.
I have scopes by both the makers you mention and am happy with either, although I do tend to use the rifle with the 5.5-22 NXS quiter a bit more these days.