I haven't tried 21.04 yet, but I plan to do a review of it sometime soon.
The Vosk speech to text is pretty exciting.
I'm in the middle of a large project in 19.12 so I generally try to avoid changing until the big projects are done.
Despite using AppImage version I've noticed sometimes running a newer AppImage will have changes in small ways to the .conf & cache files in home directory so I usually play it safe.