I'm down to two scopes, (a) Monarch 4-16x50 BDC and (b) Viper HS 4-16x44 dead hold recticle. The use would be predator / varmint on my AR inside 500 yards. Both will let me range witht he know MOA markings on the recticle as well as give me quick hold over on targets of opportunity. Both will let me dial MOA when shooting PD. The Nikon is a 50mm/1" and the Vortex is a 44mm/30mm design. The important criteria are: 1) pre-dawn / dusk light gathering 2) optic quality 3) turrets design / repeatability / accuracy Which would you choose? Why?