Both are good, but the leupold isnt even remotely in the same class, glass wise. Swaro glass is amazing. Ive owned many of both and it isnt even close
I don't agree with that. I own three Z3 3-9x36 and a bunch of Loopy 2.5-8x36. Comparing the Z3 to the VX3i there is an advantage to the Z3 but it is not that wide to my eyes. The Z3 will have a little bit better light transmission on dusk but the Leupold is very close behind. I'd say the Loopy is at least 95% of the brightness of the Z3 but only 66% of the price.