What ever you decide to buy make sure that it has
image stabilization
minimum 30 fps - 60 fps is better.
A 4K (sports) camera is no good if it records at 15fps and has no image stabilization
I have over the years had several types like GoPro Hero and others but I found the Sony Action HDR pro's are neat. I can and do record at 120fps so I can do Slow motion plus it has (optional) the wristband controller with GPS tracking.I can see what the camera sees on my wrist (or remotely) and control the camera without touching the camera (or use your cell phone).
If you can afford it these are way ahead of anything else on the market. The GPS tracking is cool (puts a little corner map of your route into the video) .They are already waterproof. You dont need a case unless you scuba dive.You can even change out the lens.(not easily)
https://www.sony.com/electronics/actioncam/fdr-x3000-body-kit