Osmo Action 6

Depends on what you’re doing. I’m really liking the low light performance on the Mission 1 so far. The Action 6 loses a lot of detail in low light. The built-in mics and audio on the Mission 1 are better than the Hero 13. DJI has it beat with wireless mics at the moment, but the mics won’t survive all activities an action cam might be taking. The Mission 1 could be the wrong choice for you. I’m pretty happy with it so far.

If you are a videographer you of course know that you can totally get away with using actioncams for BTS. Done that a lot of times for online and TV productions, and is is pretty common to do that. Not of all of us are Ridley Scott. Personally I reall like the nano for its form factor. you can mount it pretty much anywhere and is is quite unobstrusive. Which is a big plus for behind the scene footage. You have to keep in mind that the runtime of the nano owthout the vision dojc is significantly shorter and it does have to get recharged on the dock pretty much every hour or so if you dont want to risk it shutting down in wrong moment. Also it does get pretty warm over time if you set it to record in the max bitrate. Real life performances of the nano: 1.5 hours, body mounted, indoors, low light mode (blacklighted room), no problems at all 1 hour, 240fps / 1080p, body mounted outdoors, no problem In terms of quality I can only compare it to my action 5 pro, and they are both on par under all conditions. And that is still pretty much comparable with the Action 6. The 6 has of course a better performance in low light which might be a key factor in BTS applications. In conclusion the nano is fine if you use it in a way and for a purpose that it is fit for. Like POV mount, fire and forget. For point and shoot I'd opt for the Action 5/6.

Different cameras for different things. Battery life, low light, fast UI go with DJI. Overall video quality, skintones and stabilization go with GoPro.  As a pro user I choose GoPro over DJI but would recommend DJI for beginner not caring about the mentioned things. :)

DJI Definitely has overheating issues. I have used both extensively and GoPro is hands down the better option if you are going for image quality, color and superb stabilization. Remeber that gopro processes 3x more pixels in 5.3K 8:7 video vs DJI with 4K 16:9. GoPro I can match in Davinci Resolce with my FX3 but DJI is a bit harder.

Sure. Im more interested in real world use. In my experience with all brands overheating is most of the time user error and using the camera for purpose they are not intended for. I notice not a big difference in battery use between the brands. All go easily over an hour. But also I have plenty of spares and switch them out wuite often. 

Color profiles is not the same as how the camera manages color. Im talking about LOG profile grading. Thats the only thing I use on either. GoPro just excels at this. The point in GoPros stabilization is the ability to shoot completely uncropped and stabilize and crop in post with GoPro players Hypersmooth Pro (formerly Reelsteady). Rocksteady doesnt look very good especially on FPV flying. The stabilization is not very good when it has to be real time compared to one you can actually do and refine in post. I had three Osmo Actions on a TV pilot shoot. Used 25fps 2.7K and two of them overheated eventually. No airflow as a dashcam style but in winter time so way colder. No need to pretend a camera with passive cooling wouldnt overheat when abused.

Pocket 3 has the better video quality but I went with action 6 because I didn’t want to have to worry about it in the rain/water

Action 6, no question. Last year I had both the Osmo Pocket 3 and and the Action 5 and chose to bring the Action 5 with me on an epic road trip from SoCal to Yellowstone. We visited and hiked 3 National Parks on that trip, and the Action 5 was amazing. I got the Adventure combo, with the 1.5m extension rod - being able to get overhead video of some of Yellowstone's wild thermal features was amazing - it was almost like having a mini-drone in those instances. And the video quality was stunning. I've since bought the Action 6, because I needed two action cams for my business - the Action 5 is equally amazing and can be purchased for less $$.

I have both the Osmo Pocket 3 and the Action 6. I have the Action 5 as well. All 3 of them can work. I've used all 3 for vlogging outdoors. If I were you I'd get one of the Osmo Action cams because of the rain. I've found that both the A5 and A6 do a great job at this, and don't require any babying (on the contrary, they can take a beating!). The OP3 will be a constant concern for you because of the rain. And you will baby it a lot more because of it's perceived and actual fragility. My OP3 went back to DJI shortly after I got it because the screen would not go into vertical orientation - it would snap back to landscape. It was a widespread problem. Thankfully they fixed it free of charge under warranty.