I have a Nikon Monarch 5-20 x 44 SF and a Leupold VX3 6.5-20 x 40 Adj. Obj.
The glass on both are equally clear, crisp and bright. The Adj. Obj. on the Leupold is a little more convenient to adjust compared to the Side Focus of the Nikon, especially under poor lighting. The elevation and windage knobs on the Nikon have a much better defined "click" feel when making adjustments, the Leupold's adjustment "clicks" are soft and not as well defined. Both hold their settings extremely well. I won't complain about either one, they're both nice scopes.
OBTW, the Nikon is mounted on a .223 cal. bolt action, and the Leupold's on a .223 cal. AR-15, so neither are seeing much recoil shock.