Zeiss to my eye is superior in clarity and brightness. I also like: 1 piece tube construction, constant eye relief, standard reticle(plus itched)and power adjustment of the zeiss better then the loopy.
x2
But the one thing I found with the Zeiss is if you are on 3 power and go to 9 then you have to re-adjust the focus to get a super clear picture.
I find that if I adjusted the focus at maximum magnification,it was good at all magnifications.