Have a couple of the Vortex Razor 3-15 LHTs. and several of the NX8s that I use on "crossover" guns. Havn't had a chance to handle the 4.5-22 RAZOR but I'm sure its a very nice scope as well, and the mechanics between the two (3-15/4.5-22) are said to be very similar. However, if within a few hundred I'd go Nightforce EVERY TIME. Weight considerations and maybe a preferred reticle would be the ONLY reason I'd pick the RAZOR over the NX8. The nightforce just seems better built and more substantial when handling, and the glass is better to my eyes. The NIghtforce will also mostly likely hold a better reseale. Once the " new" wears off retailers will be selling the Razor for way less than the $1499 MAP pricing I'm sure, and IMO it plays a lot better in that price range.
The 2.5-20 does have a few negatives against it, edge distrotion on 2.5 power and a little picky on the eyebox being the two biggest detractors. My 3-15 Razor also have some distortion at 3X, but with both scopes unless your looking for it, its a non issue IMO. The RAZOR seems easier to get behind, but if the Nightforce is set up properly its a non issue to me. With that being said I much prefer the 4-32 Version, I just think its a much better scope across the board. The reticle is pretty small on 2.5X so Its not all the useable to me on the low end anyways, and the 4-32 is easier to get behind and clarity is better IMO.