There is an article you might find interesting called "what the pros use" and it is a summary of whAt equipment the pros Re shooting at the PRS Finals.
You should read this years article. In the PRS, one Nightforce made it into the top 40 and I don't think there were any in the top 20. The top competitors were using Schmidt and Bender and Vortex Razor HD Gen II nearly exclusively.
To be more precise about some of the previous comments, comparing a Vortex Viper HS to a NF NXS is not a good comparison. They are designed to meet very different needs.
Even a Vortex Viper PST is a closer comparison. I shoot one of these and performance is absolutely great. I am looking for a used NXS to put on my next build so that I can know what I am missing, if anything.
And FYI, look up the scope testing article that is a sticky on the optics forum. Some of the vortex tested better than NF. But individual results will vary.