I've used the VX-2 1-4X20, VX-3i 1.5-5X20, and the FX-II 2.5X20 on short-range woods rifles.
The 2.5 is the most rugged, but the eyebox is harder to get settled into. Not hard, just not as easy as the other two. Also less FOV than the two variables when on low power, still good, but less. Eye relief is very generous. It's also the lightest.
The VX-2 is shorter and lighter than the 3i, FOV slightly more one low power, but the 3i has just a tad more magnification, though there is no real field difference. Glass may be a touch better with the 3i.
In my mind, the combination of lightness, eye relief, FOV, size, ease of use, and glass quality make the VX-2 the best value, but real world differences aren't that great. I presently own all three.
