Lower frame rate captures more light and data per frame but anything lower than 30fps on a moving vehicle gets too choppy so 24fps is a no go.
Personally I am not in your situation. You do not want to be changing resolution mid video though, it'll look crap. look out the window, if it is overcast or dark go with 30fps, if it is a beautiful day go with 60fps. I have a GoPro Hero 5 Black which runs 1080 60 which I run for day and night riding. If your camera is unable to do that then you will have to try both settings and see what works best, but I personally find 30fps videos very difficult to watch even at town riding speeds as it is very jerky.So do you stop your ride to adjust settings in your camera(s) for varying light situations?
Or do you make a judgement before your ride and then leave the settings alone?
When you talk about low light, do you mean cloudy/overcast or dawn/dusk/night?
Captures more light but also introduces more motion blur. 30FPS is great if you want to amp up the vibrance and brightness on a vlog for show on a crappier action cam, but if you're using a camera as your daily ride dashcam, you might want to have a higher frame rate and thus higher shutter speed for clarity, especially to capture plate numbers.
I don't use image stabilisation on my headcam, it adds a seasick inducing motion to the video I've found even with the higher end cameras like the Sony. I've watched a few vids recently where the vlogger is moving their head around so much the image stabilisation can't keep up and looks like it is having a meltdown!Plus with modern cameras that almost all have stabilization these days those quick movements like turning your head while riding are greatly reduced so motion blur comes to a minimum. I've primarily only used GoPro on and Sony Action Cams so I can really only speak for those. Side note is that Sony seems to have a shallow focus length so clarity at a distance is a little lost of something closer is in frame.
I don't use image stabilisation on my headcam, it adds a seasick inducing motion to the video I've found even with the higher end cameras like the Sony. I've watched a few vids recently where the vlogger is moving their head around so much the image stabilisation can't keep up and looks like it is having a meltdown!
I use 1080 at 30 fps, i think is well enough for youtube, and the rendered file has a good size for a quick upload