I had the Pinebook Pro. It was pretty good, solidly built, had a 1080p screen and could handle Openshot video editor, web browsing and video playback. All I needed.
I didn't have it hooked up to an external display but according to the website it can handle 4K playback. Mainly used it for listening to music in Cmus whilst browsing in Firefox.
Battery life was pretty good, about 10 hours IIRC but mine just stopped booting after I left the battery dead for a few months.