qTranslate X and polylang are two popular plugins for adding multilingual capabilities to WordPress sites. qTranslate X allows languages to be switched within a single page or post, while polylang creates separate pages for each language. Both plugins have over 100,000 installs and support teams, but differ in their approaches - qTranslate X provides an easier switching experience while polylang allows for more separation of language content. In the end, the presenter concludes that the best plugin depends on each site's individual needs.