I can't find a good editor for Drupal 8. There is CKEditor in the core, but it's somehow quite small. Under the 7th version, it seems to find a lot of things (TyniMCE), what is under the eight?
It's not entirely clear what CKEditor means "small"? You can add all necessary buttons to the editor panel or enable CKEditor plugins in the settings. In any case, this is the best choice for Drupal 8.