For me it is blackvue, thinkware, and viofo. Personally thinkware has become my fav.
blackvue has the best cloud feature hands down, especially once they get their 4G LTE feature out, but it seems their cameras suffer from over heating more than comparable brands like thinkware. supposedly the new 750X/900X models will help that. Also in the 5 1/2 years I've been apart of the community it seems like they suffer from focus issues. My DR900 seems to be suffering from it, as my DR550 5 years ago did too. I remember one of my first youtube videos was how to fix the focus.
thinkware doesn't have as good of cloud features, but i think overall they are my fav because they do everything, cloud, good parking, decent video quality (especially the new U1000). I have never had one overheat in the 3 or so years I have been using their models. I have used the F770, F800, F800 Pro, Q800 Pro, and now recently the U1000. Although the U1000 I just got recently and live in Minnesota so I havent had a chance to test that one in heat yet.
for the record, advanced buffered parking mode is one of my most important features, for some thats not what they want, but it is for me. So thats a huge reason those two brands are in my top 3.
Viofo seems to be hit or miss, but at the least they tend to bring great video quality for a low price. Now with parking mode 2.0 and buffered parking mode they are getting more and more advanced. They definitely are behind blackvue and thinkware in terms for parking mode and no cloud, but you look at the A119 V3 and the video quality is just so great. Blackvue and thinkware don't offer cheaper models that lack fancy features, but have better video quality. Its basically all or nothing with them.
I know street guardian is loved around here, and I know they have great quality and customer service. Honestly tho, I lost some excitement waiting so long for the dual remote lens model.
@jokiin whens it coming!!!!???