I have experience with sentinels and -31s. Both on a flat range, navigating woods, hunting, and riding dirt bikes / vehicles, and some classes (Telluric and such)
I prefer the -31s for just about everything. They are lighter, which means less counterweight, and overall less weight. I do like they they independently flip, so if you need to gauge ambient light with the non-aided eye it's possible, but still possible to use Binos when needed.
I almost always use them with a COTI, and the integration is great. Especially when the E-COTI is available and you can use just the unit and a remote battery pack, it barely adds any weight.
That being said, in my experience they are both really great goggles. I do like the built in ilum on the sentinels, especially when shooting an RDS pistol in extremely low light. Otherwise you'll need helmet mounted ilum. Of course that is a fairly limited scenario, I just happened to do it a lot while developing the go pro mount.
I recently sold my sentinels and am waiting for my WP -31s to ship. So I can report in October when that happens.
I have quite a bit of through tube shooting video with the sentinels if anyone is interested. I can try and dig that up.
I do prefer the sentinels over the BNVDs, but my experience with the BNVDs is very limited, so that's mainly just from handling them in daylight.
Edit: forgot to add. I believe there were some reports that the -31s caused headaches because they cannot be reliably colimated due to the angular inter pupillary adjustment, whereas the sentinels are linear. My adjustment on both falls near the center of the range and I have not witnessed that issue first hand.