Quite a hard call. Any of these would make a good dash cam. If you want an action camera/dash cam? SJ8 Plus at the bottom of that list as far as night driving in my other tests though. Good at 4K and has EIS @ 4K.
Hi Tony, I agree with your comments about the 170 deg lens being better suited to action. Any car stuff will appear to be quite a long way off as well. They all offer loop recording I guess in case you might want to use for car as well. The Firefly comes in a 90 deg AOV (I have reviewed it ) probably better suited for car use. And most offer the option of wide / middle or narrow AOV but they just use a smaller area of the sensor. If they are good res you'd probably still get a good image for car use. I was promised an HD dashcam a while back, I think Sony? but it never showed, that would have been interesting!I've tested the mijia mini and some other action cameras against dashcams. The action cameras typically have wider angle and smaller aperture lenses than the dashcams - great for a helmet cam but not so good for capturing details of moving cars. They still do a good job though if they can use the advantage of their higher video resolution than most dashcams.
Anyway, thanks for putting this together as I know it takes a long time to compile these comparison videos. As you said, there's not much between them. Personally I prefer the narrower FOV of the Mijia which is one reason why I bought it.