This is my comparison of the DJI O3 camera with the Runcam Thumb Pro W, sometimes called Thumb Pro V2. I am only comparing the image quality, not the functions in terms of power supply or transmission.
00:00 Intro
00:10 Sunset
01:35 Low light indoor
02:30 Blue Sky
03:08 Manual Mode with ND filter
03:40 Slow motion 120fps
04:40 4:3 recording & flat color profile
06:18 Gyroflow stabilization
07:05 Conlusion
If you fly an analog copter and the quad can't carry a GoPro, the Thumb can be a viable, lightweight alternative. If you are flying with a digital system anyway, it doesn't really make much sense to attach a Thumb. Unless you want to record a vertical and horizontal video at the same time, then the Thumb mounted vertically might still be quite nice. In this case, I would prefer to record in 4:3 with the O3 and create a vertical video from it instead of having two cameras in use.
This video was created with the help of a free Text To Speach tool, so the voice is computer generated.
No commercial profit intentions, no affirmative links, no bullshit!