Since coreelec is using kodi master, what is the coreelec version that uses kodi stable(v17?)
Coreelc only started with Leia so there is no version of Coreelec for V17.
Current versions of Coreelec have overcome most of the issues with stability and are ready for daily use. Most lingering issues are with Kodi itself and most of the development in Coreelec will simply be absorbing Kodi fixes.
Shoog