Everything depends on personal needs, animagic is right, Character Creator is becoming a universal tool to be able to import, modify and expand the possibilities of any existing character. You can interchange any CC hair whether purchased or free. Either go to the marketplace to find them or find "uninstalled" resource packs in the content browser using the content browser settings. CC capabilities is well beyond user needs of the resource packs that come with it.
Metahuman has for less customization than Character Creator. It would be useless for my work. for example.