I did the same project about a year ago. I started with LibreElec, but there were a lot of weird bugs and quirks, and I was at the point where it was crashing 3 or 4 times a day. Whenever I went to get help on their forums it seemed like every thread of theirs was closed with no resolution due to piracy in the logs.
After that I installed PopOS and use Kodi that way and its been really solid.



If you need a web browser you definitely do not want LibreElec