jQuery Migrate is the more common of the two in our index: it runs on 6,038 websites against 84 for SweetAlert, and 15 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.
SweetAlert is a JavaScript library that provides alternative alert and modal dialog boxes for web applications, with customisable features, aiming to improve the user interface of the default browser dialogs.
15 sites run both jQuery Migrate and SweetAlert. That is 18% of the sites using SweetAlert, 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.