The VXR has slightly thicker crosshairs than the others, but the simple little red dot is sweet for hunting. The size balances a 16" rifle just right but 7x (it's actually more like 6.5x) is on the low end for target shooting and load development especially in combination with the thicker reticle. I sold mine only because I wanted a little more magnification, but this is great for a typical short range AR setup.
The VX3i 3.5-10 is nice but a little bigger. I would pick this one if you really intend to shoot out to 400 yards. And get the CDS dial, it's just a low profile type knob. I use the standard 1/4 moa caps but you can get a free custom engraved cap for your load if you want.