I have tested LibreELEC on a RP3 B+ for several weeks and it works perfectly as a frontend to my MythTV backend PVR.
There are times when I think it would be useful to have access to other apps on the RP3 so I've tested Raspbian with Kodi as an app. It works okay, except for the fringe cases like switching HDMI inputs away from the RP3 and then back later. It doesn't always return to the Kodi display.
If I give up the need to have other apps beside Kodi, then LibreELEC is perfect. I'm just wondering if others have noticed issues with Kodi on Raspbian not seen on Kodi on LibreELEC?
Jim A