When I had to make that choice 4 years ago I went with the Zeiss, still have no regrets.
That said not everybodys eyes are the same, I looked through the 6.5x20 VX3 and 6.5x20 Conquest side by side and the Zeiss was clearer to me by a noticable amount, others don't notice any difference, and still others prefer the Leupy.
Best thing you can do is look through both and let your eyes decide.
Chris