These two scopes are around the same pricing (street) and performance in terms of magnification.
They have similar features and build quality. They are both First Focal Plane (FFP).
They could be in your choice of high end optics, but they are very different in one major way: Weight
Vortex = 28oz vs. Nightforce = 38oz
Yes, the ATACR is longer, and larger, but the key difference in choosing between them for the price is the weight in our view.
The ATACR is a heavyweight much like the Razor HD Gen II, this comparison just gives you an idea of two brands leading products for the long range enthusiast.
If you want one scope to do it all, the Razor AMG could be your scope. It offers hunters and tactical shooters the best of both worlds.
The ATACR however offers amazing glass in a more focused and durable package that is longer, beefier and heavier. Heavy is not bad, its fine for target shooting, but if you plan a long range hunt then perhaps the Vortex is better for your needs.