I have 2-Vari-X III's and 1-Conquest. In all fairness, these are older Vari-X III's. I like them all, but prefer the Zeiss. In my opinion, I think you will be satisfied with either choice.
Put a zeiss conquest on my 375 ruger. I absolutly love the scope. I have elites, monarchs, leupolds and the zeiss is the clearest of the bunch. It will also take a pounding in the recoil department.