I'm one of those people who takes forever to make up my mind and reads every possible review.
It seems to me that Viofo, whilst far from the cheapest, seem to be best overall in terms of video quality, and reliability or lack of complaints. Nextbase look good on paper but they seem to have poor firmware which spoils the user's experience.
So I am likely to be buying the Viofo Duo Pro:
https://dashcamtalk.com/viofo-a129-pro-duo-4k/
There are a pair of videos talking about and showing how to install the duo camera with the hard wired kit:
I think I would probably have someone install it for me since I would probably damage the trim in my car doing it.
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It's not yet a cam I feel comfortable recommending as it has some unresolved issues, especially with parking mode. But it also has some apparently heat-related issues although in the UK climate this may not be a problem.
Pushing performance levels this high is pushing the technology being used to it's limits and maybe beyond, so I doubt that there will be anything better coming along soon, and AFAIK nobody is doing this better right now than the A129 Pro Duo. The A129 Duo does very well so even with it's lower resolution, it could be a better choice for overall functionality and reliability
Sad to say but the current crop of Nextbase cams are nowhere as good as the older ones.
Phil
Thanks everyone.
I bit the bullet and got the A119 v3 which is performing very well in our Nissan.
I am considering the A129 Dual Pro for my BMW which has an over run on the 12 volt socket after you stop the vehicle and I will consider putting a power-bank in line with the power circuit and manually engage the parking mode when leaving the car. At the moment I don't have that feature on the Vico Opia2 anyway so haven't missed it.
So thanks to everyone for the advice which has been great.
Regards Ron T