I would recommend https://data-star.dev over htmx. It is more complete. But it depends on what you are building. Datastar does everything that htmx can do and much more.
It doesn't have history support out of the box. I consider that essential for hypermedia apps. When I'm loading fragments into my page I need to push the URL of the fragment I just loaded so the user can reliably come back to that specific resource later.