I have all 3. The razor 1-6 is a great optic and for within 300yds its tough to beat. very clear. the least amount of distortion on 1x and a very simple usable reticle (JM Ret). The dot is very much daylight bright and the BDC is pretty much spot on.
The Trij 1-8 is a nice optic, not quite as bright as the Razor, clear bright glass (eye box is a bit less forgiving) and is nice and light. The center of the reticle is obnoxiously big at 8x, but that is offset but using holds at the distances you would want that magnification.
I just received the NX8 and Ive only had it to the range a few times so far but I am very impressed. Clear glass, extremely bright, light weight, reticle is very user friendly, its pretty tough to beat. I have yet to use an ATACR 1-8x but the NX8 is impressing the shit out of me so far. Once I get used to it I'll be running it on my primary rifle in comps. For the money, for 300 and in, I'd suggest the razor.
You won't be disappointed.