Call me an oddball but I personally think the Midas TAC has better glass than the Viper PST Gen 2.
At least with the very limited number I’ve through side by side out in the field, not in a store, the Midas TAC had better glass quality.
The warranty between Athlon and Vortex is the same, with the exception that I think Vortex will still warranty a scope that has been painted, whereas Athlon will not.
Capped Windage turret is also another benefit for the Midas TAC, again, in my opinion. Between all the different ways people carry rifles(slings, backpacks, etc.) it is easy for a Windage knob to get turned if it is not capped or doesn’t have a locking feature. Maybe you need to shoulder the rifle quickly to shoot, whose going to stop and look at the windage turret? Not many people. Elevation is easy on the Midas TAC with the Hard Zero stop. Not sure about what mechanism the Viper uses on the elevation turret.
Just my opinion. I went down a similar path you’re taking and decided the Midas TAC was the route for me. I loved the first one so much I bought a second, and already have plans to buy a 3rd and 4th TAC. I have two 6-24’s currently, and plan to get two 4-16’s