Remember they are not optics but video screens.
The whole experience is closer to Pokémon than the olympics.
If you are flying or participate in 10 minute raids like Delta, use dual.
If you are not one of those two people, use single with IR lasers.
It is a lot easier taking a **** behind a tree with one eye open.
You can also close the optic eye to mitigate migraines with still one eye open.
Are you running throat to skull radios? Because it's easier to dick with a radio in your hand with one eye open.
Opening doors or gates?
Walking around dangerous micro terrain?
Is the moon overhead?
Kids? Wife over 40?
Leave one eye open. You can put 100 sensors on the other eye but leave one open.
They actually are optics as this is NV, not thermal, so completely analog. While cost factors will likely drive most to a PVS-14 mono, if you can get the BNVD's, get them, its not even close.