How do Vortex Scopes compare in quality and optics to Leupold and Nikon?

As far as quality and durability vortex has Leupold and Nikon beat.

Optics_----- That's all in how you see things .I have looked thru the vortex viper HS model VHS-4302 44mm,Leupold varx-3 2.5x10 50mm and Nikon Monarch. an Apple to Apple comparison. Vortex won in clarity but lacked slightly to the Leupold in low light clarity followed by Nikon. Very slight differences between all 3. Vortex around 380.00 us. Leupold comes in at 549.00 us, and Nikon at 479.00. for the money its Vortex, leupold then Nikon.