I use different settings depending on what I’m doing. I usually find that 1080, 25fps, and the wide setting works pretty well but I will usually film my flights using the GoPro 2.7k 25fps setting. I will usually publish my videos in 1080p.
The higher the resolution/frame rate, the more battery power and memory card space the camera will consume.
Why 25fps and not 30?
Our electrical system here in the UK is at 50hz, rather than the 60hz you may be familiar with in other parts of the world, such as America. Therefore, our TV programmes are broadcast at 25fps.