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Are you looking to hunt/detect, or do you want to scan/ID?
Both are very good. Each fill a slightly different role. Thermal is damn near impossible to hide from, whereas NVDs are much easier to hide from in comparison. If you go NVDs you better resign yourself to also getting a good IR light to go with them or you may end up being sorely disappointed depending on your AO.
If you could only have 1 the NVDs are far more utilitarian. With a good IR laser and a helmet mount...Well, its damned cool. Wont lie. But you need, nd I do mean need, a good IR light to go with it.
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Yes and no on the "IR Light", i.e, additional IR illumination.
Anything below 3rd Gen Pinnacle autogated, yes by all means get some extra IR illumination.
That being said, I rarely use extra IR illumination with our PVS14s.
There will be times when you can use a little extra illumination,
but IME people end up using it too much. It's no longer "passive" when you are spraying the countryside with IR- any boob with a $200. Russian Breakalotski no gen model will be able to see the IR illumination.
IR LASERS you use sparingly, touch the pad, break the shot, release the pad and probably move if you can afterwards. Your NEVER going to be totally invisible at night due to your muzzle flash. Almost 30 years ago now, we were taught to shoot at night with iron sights via shooting at the small fishing cyalume lightsticks taped to the center of targets. One of the guys asked the old SF guy what the lightstick was for.
"It's to simulate muzzle flash. Sometimes at night that's all you have to shoot at."
I personally try to avoid using extra IR if possible, it has it's place no doubt and sometimes it will be damn near necessary,
but be careful not to allow it to become a crutch.