Stay Safe !
The Bausch and Lomb 10x works better for me; the coatings on its lenses appear to be better compatable with those wearing prescription lenses/glasses so far as reducing glare and mirage distortion effects at a distance. That's probably a matter of some difference between different users eyes, and it's probable that several alternate possibilities better suited to the individual shooter should be offered; the US Optics unit is at least one possibility, and there are those who really swear by the Shepherd scope as well.
Back in the days of the ART II/XM21 when I made my living with an M14, I had my choice of three to use, one with the Letaherwood Auto-ranging scope, one with a 2-7x variable, and one without a scope at all. I also tried out an Australian L1A1 with a 4x SUIT scope a couple of times, and found it very usable and acceptable for the mostly 200-400 meter ranges at which we got most of our shots; those with M16s could generally take care of those out to 200 okay once they settled down and shot like riflemen instead of hosing, and beyond that, artillery or CAS was usable if available; I'm certain I killed more people with my radio than I ever did with rifle fire, but we had artillery firebases well established in our AO and our cannoncockers were generally pretty good and enthusiastic about their work. I expect that designated marksmen working with M14s [or SVDs] today at the squad or platoon level whoul find things to be pretty much the same, with some local conditions affecting the distances involved, of course.
I did get out with an old scoped #4 Enfield more than once, and it worked just as advertised. But compatability with night sights/thermal viewers will be more of an issue in the future, and what's really needed is a day-night sight, or a rock-solid mount that allows switching as needed. I suspect that in the future, the work of both the DM and the hard-core sniper will be done at night.
-archy-/-