I've evaluated the Trijicon 5-20x50 at the last few Shot Shows. The optical performance was similar to a Zeiss Conquest 6.5-20x50. Glare was low in both. Contrast was better than average for that price point.
I've evaluated Vortex Viper PST
6-24x50 a few times. Optical performance is OK but not in the same league as either the Zeiss or Trijicon. For the PST, glare is obviously worse. Contrast is likewise considerably lower.
While people use PST scopes for hunting, I consider them to be more of a range scope. For hunting, I would prefer something with better (lower) glare and a lower mag range. In the Viper line you have to drop down to 4-16x, which would be fine for me but may be too low for some folks.