I once changed from EN X9 to EN 20, only to find out that the layout was horrible (which I probably could live with) but many features I used in EN X9 were no longer available. So I changed back rather quickly, for me EN20 was a downgrade.
EN20 is the Clarivate version of windows 8. Will EN21 be based on 20 or on X9? Should I upgrade this time?