There are several enhancements with this upgrade. Accessibility improvements in key Moodle pages like the Dashboard, many of the Activities, as well as aspects of the Gradebook.
Full H5P integration: H5P is now available as a Moodle activity that teachers can connect to the gradebook.
A new Content bank for H5P: a shared space where you can create and store H5P activities and use them anywhere in your courses. Download Course Content allows students to download content from the course, the Quiz Timer now scrolls as the students work through the quiz and
the Folder resource images and HTML files may be viewed directly in the browser without downloading them. Check out the Moodle 3.10 New Features.