Swiper is the more common of the two in our index: it runs on 7,270 websites against 5,111 for jQuery Migrate, and 1,241 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.
Swiper is a JavaScript library that creates modern touch sliders with hardware-accelerated transitions.
1,241 sites run both jQuery Migrate and Swiper. That is 24% of the sites using jQuery Migrate, 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.