I've used single and dual 14s several years. They are clearly better on depth perception in all circumstances. However, I do not want to run in the woods after a fleeing "thing" with any NV. Had no problems at 35-55 mph in a vehicle.
I've used thermal for less than NV, but have learned mine well enough to have depth perception with thermal, but not like NV perception.
Driving golf cart, walking on clear fields, and moving through open woods, I have reasonable depth perception that has been acceptable and so far, zero safety issue.
But, I do move slower.
Because the field of view is limited, in thermal, speed while moving is no go, worse on foot, horrible in rough close terrain.
Mixed dual nv with thermal, green nv and red lense thermal, my mind sees both, and recognizes both images, I have peripheral vision with the nv at least 50% of the time, none with the thermal screen.
When my conscience recognizes something of note, I blink first one eye, then the other, and determine which best identifies the object and which best gives me the where. I end up focusing on one or the other, not both.
Driving clear roads in a golf cart or non-windshield ATV, no problem with the mixed dual, just more slowly than with the other two singularly.
Walking is also slower.
Sitting in a blind, best of both worlds, see something of note, blink, determine which works best, focus, and deal with.
My experience, so far.
The first time blew my mind.
Got easier with time and use.
Depending on previous nv experience, the learning curve may progress faster if you are really comfortable with nv and dont get headaches using it.
Same for thermal if you have helmet mounted experience and previous movement to contact using it.
And it may depend on your tolerance to it and eye health. I've got a shooter with almost zero tolerance and single use NV or thermal, one hour on glass and hes miserable done. My main partner is good for about 4 hours. I've done 6 hours, but prefer less.
Theres lots to learn and everybody's learning curve is different. I was ok after a couple of weeks, and I credit that to 20+ years on NV and 10+ on thermal.
Best to you,
vr