I have both and like them both. To me, the determining factor is the type of firearm it’s going on. If it’s a gas gun, go mark 5. Bolt gun , go Cronus. I think both are great Optics and both are at the top of this tier of Optics.
The Leupold is much lighter. The glass seems about the same to me. I prefer the turrets better on the Cronus only because they have 10 mil revs. The Leupold has 10.5. I’m just picky. However I like the M5C2 turrets on the leupold.
By the way, I’m selling both so if you have any specific questions or would like to buy one. They are also posted in the PX.