Compare A139 and new 129+SN
My advice is to stop using the A129+SN names here and on Youtube because this will create confusions and will make people starting asking what is a129+SN, if is better than A129+ and so on.
You know very well that the only difference between A129+ and A129+SN is the Wi-Fi chipset and if you really want to make some comparison which is including the SN name it should be only if you want to compare the Wi-Fi speeds. But also this comparison will not help because the A129+ without SN is not produced anymore. So please use in the future only the A129+ name.
To me 129+SN looks much better than 139. How come?
In
theory could be 2 reasons:
1. as you can see for example at 1:28 on the video, the A139 lens angle seems to be wider compared to A129+, even I don't expect this.
2. it is possible that the A139 video to be processed twice before comparison.
(All my video comparisons even are not looking nice, professional, are encoded side by side using avisynth, so no pre-processing is involved, both source videos are raw. This is why I don't have intro, outro, subtitles, text over video, just the original video from the dashcam.)
Of course can be also the reason written by vvs49 about dashcams mounting positions.