Debian stable + flatpaks is a great combo. Sometimes I still wish some packages were more recent (not fun when yt-dlp starts breaking), sometimes I’ve been let down by their oldness in Debian Testing, and even Unstable (wanted to test Plasma 6 for instance). Overall I’m happier that there’s way more stuff in the official debian repos I would have to use AUR for otherwise.
I’ve been surprised by the ease of use and stability of MX Linux, they also maintain a repo with some key packages updated, like Firefox. It’s Debian Stable with a few tricks up its sleeve.