Wow, that YT review of the two cameras was
awesome — so incredibly helpful. 

I wished more reviews were made this way.
Especially helpful was unearthing a detail that no specs list will ever have told us —
that the TriggerCam cropped the recorded image by 50%. Which is bad for most hunting shots that want to show the surroundings of the shot and then the aftermath. And of course unacceptable for holdover shots that go beyond 5mil (a lot of my shots are well over 5mil in my low powered gun...).

Maybe I misunderstood the YT review — but it seemed like he was comparing mostly the brightness of the image of
the live view through the scope —
and not so much comparing the
brightness of the recording.
Related to that: What was missing in the review was one of the reasons for this difference:
The prism that directs part of the light to the camera — What percentage arrives at the shooter's eye and what percentage arrives at the camera's lens?
Both Tactacam and TriggerCam keep quiet about this detail.
The EagleVision model offers two options: 50% to the camera, or 75% to the camera. Depending on what your emphasis is you get to choose.
The darker image on the Tactacam might mean that it's percentage to the eye is smaller than that of the TriggerCam. Or.... — that the TriggerCam has a much better camera lens that will pick up more light.
But again, both manufacturer don't tell us the specs....
With some other posters, I'll keep my Tactacam for now — waiting for the TriggerCam to fix the forced image crop and their app.
And while waiting, I will try out the Firefly with the locally produced
InkaScopeCam Adaptor 2.0.
Matthias