Early on in my LE career I was in Danner's sometimes 16-18 hours a day. At the end of my career (after the bumps, bruises, surgeries, and a few extra lbs) I moved to the Under Armour light weight ones.
I bought the Leupold and the clarity is fantastic. My biggest complaint is that it is NOT daylight visible. If you need the daylight visibility for run and gun, I would go Vortex Razor