I have the VX6HD 4-24 on my 300 WM. IMO it's a fantastic scope and I feel that it's the best scope that Leupold has ever produced. Is it Nightforce durable in adjustments? Maybe not, but it's done everything I've asked it to do beyond 1000 yards in over a year of use.
Based on reputation, the Nightforce NXS has more durable adjustments, but you have to deal with inferior glass, screwy parallax, ancient illumination adjustment, the annoying magnification/eyepiece adjustment, and excess weight. I can't, in all honesty, speak for the ATACR other than I know they're heavier than the NXS, but users have stated that the ATACR is said to have corrected the common issues/compromises reported by users of the NXS.