Leupold Mark 5HD VS Nightforce NX8

I own all of the optics in your post. The nx8 has worse glass than the pst2 but it feels the most solid out of the 3. The illumination and reticle is the best of the 3. The turrets are okay. People complain about eye relief on high end and while it's pretty tight the only time you'll ever use max magnification is when you're shooting groups at 100 off a bench so its not unusable.

Mk5 has the best glass of the 3, turrets are the best of the 3, and the eye relief is good. It feels very fragile probably because of the weight, but I haven't had any issues with it yet. I actually really like this scope.

I got rid of my atacr 4-16. It's too heavy and the glass isn't good enough to deserve it's price up here in Canada. The rotating ocular housing also annoyed me more than anything.

If this is for a hunting rifle I would go with nx8 because it's the cheapest of the listed optics but still very good and has the most usable magnification range. If you got a discount and could pick up the mk5 for less than the nx8 I'd go with that instead.

Edit: I see this as being confusing now that I've re-read. When I mention "all 3" I'm referring to nx8, mk5, pst2. Atacr was a side thought after the fact.