If you want to record a journey to show your friends, use 1080P. If you want evidence for any incidents, use 4K and loop recording. With a 5 minute loop, you'd only need a few GB of storage.
Garmin Virb Edit. Give it a try as it works with any camera and if you give it the Strava GPX file you can add loads of geeky stuff and renders mine at 60FPS..