1st- Do not get a reticle in MOA and have turrets in MIL, that is counter productive, and a total waste of money.
2- Nightforce ATACR, BEAST and NXS have the same glass. That was confirmed by nightforce.
3- At the price points you are looking at, glass is almost a non issue, every scope at this price is an 8,9,10 on the scope scale. You are looking at features, warranties and reticle differences.
That being said, both are phenomenal scopes and more than worth the money. Find the reticle, features and dialing system you want and Send It!
Also, check out the high end scope comparison on precision rifle blog .Com. it's a very in depth test between 18 scopes all priced above $1500. It's the most fair test I've ever seen, but remember, don't believe everything you read on the Internet. Check the scopes out for yourself.
The Kahles was the 3rd best scope he tested behind the Beast and the Schmidt and Bender. At the time of his testing he didn't have an ATACR F1.