jQuery Migrate is the more common of the two in our index: it runs on 7,105 websites against 71 for lite-youtube-embed, and 4 sites use both. Counts come from real scans, not vendor claims.
Query Migrate is a javascript library that allows you to preserve the compatibility of your jQuery code developed for versions of jQuery older than 1.9.
The lite-youtube-embed technique renders the YouTube video inside the IFRAME tag only when the play button in clicked thus improving the core web vitals score of your website.
4 sites run both jQuery Migrate and lite-youtube-embed. That is 6% of the sites using lite-youtube-embed, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.