I'll step on this landmine. First to say, I have no experience with the non-wired rear cameras. That said, my first experience was with a high-end, expensive, OEM quality system built into the rear-view mirror, with a cabled rear camera. The mirror could be used as a mirror, or as a screen showing either or screen-in-screen with rear. Pretty cool, and was faultless for a couple years.
Now the punch line. The system had a crash recording system, that is loud noises set it off to 'lock' a video. My dog barking proved that it worked a number of times. Then came the day I needed it, we got spun into the median divider head-on. Upon coming to my senses, I turned the key off as the engine was still running. While reviewing the cam footage of the wreck, it recorded the segment before the crash, and the next upon turning the ignition key on again. The wreck itself, and the proof of fault, was absent. Turns out the thing records in 30 second loops, and if you turn the key off before it finishes it doesn't keep it, even in a 'locked' event. Chinese scrap.
So my next decision was based on something very simple; I like to watch crash videos on YouTube, and most of the videos show what brand of camera the video was recorded on. The most common, and so I assume the most reliable and consistent, was Rexing. I bought 2 different styles, and they both work great. They have supercapacitors so if your battery disconnects they still have power. They have a smart power connection available so you can have parking accidents recorded with the key off. The G-sensor for crash/bump detection and video lock are adjustable. They're easy to install and you have many choices of style to suit. That's all I have, so far.
