Thank you for your reply. I would actually prefer to match everything to the source file as much as possible. But I encountered a problem when outputting 4:2:0 signal to my LG C1 tv - the tv does not display this signal… And since forcing 4:2:0 output requires two steps to be applied - changing to 4:2:0 and changing the resolution - I get stuck with no signal, because after the countdown the resolution is reset, but subsampling remains 4:2:0, which the tv doesn’t display. So I have to reinstall CoreELEC, or use a backup of it. Will have to investigate further to hopefully make this work.
Edit: Hm, found this post, so I guess for movies that are mostly 24 fps - setting 4:2:0 is not possible, so only resolution, fps and bit depth can be matched with source.