You’ve named three great suggestions. There was a new stable Debian release two days ago. A decade ago, I found Debian stable a bit too stale and testing buggy, but things have changed for the better with flatpak being as ubiquitous as it is.

Just make sure to get the non-free firmware iso if you think you might need it for something like wifi.

I find snap on Ubuntu annoying, slow and the cli tool cryptic. I’d probably use PopOS in preference to Ubuntu just because of that.