From my research and hands on experience I ended up with an NXS model.
The BR is designed for Benchrest shooting. The parallax adjustment is on the objective rather than a seperate knob on the side. Also the NXS is illuminated. It took me awhile to learn that while I was looking through various ones at the range. It isn't obvious until one reads the manual.
The BR version is more difficult to look through. The eye has to be placed more consistently with more narrow margins. Just my experience.
Looking though the NXS 12-42x56 was a real dream. During moderate mirage conditions a small sparrow like bird was a good target at 1K @ 22X. Any part of the dickie bird was a good target on 42X. That experience was what swung me to the NF scopes.
Goto 3rd Generation Shooters Supply, a sponsor here, and talk to BJ or Steve regarding availability. Tell Roy sent ya and they'll add a couple of hundred bucks to the price.