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This is popular question for multilingual or multi-regional sites. And answered many times: https://support.google.com/webmasters/answer/182192?hl=en The main problem is that this questions have many answers. And all of them are right, some more, other little more. Just don't forget that no matter what way you select you need to keep relevant language links to each language site. And keep hreflang to other language sites too. https://moz.com/learn/seo/hreflang-tag https://moz.com/blog/hreflang-behaviour-insights https://moz.com/blog/open-source-library-tool-check-hreflang https://moz.com/blog/using-the-correct-hreflang-tag-a-new-generator-tool

Hi Stilianos, how did this work out for you?