I believe the Zeiss Conquest is slightly optically superior to comparable Leupolds. At least that's been my experience with the ones I've owned. I also prefer the etched Zeiss Z-plex reticle to the wire Leupold duplex. From a durability standpoint, I've had no problems with either brand. If I were buying another scope right now, it would more than likely be another Zeiss Conquest 3-9x40.