Eh, I’ve always felt these solutions are complementary, or supplementary, rather than a “versus”. Each one, in particular cases, covers gaps the others can’t cover. The only one that’s unneeded is Snap.
For example, I like Flatpak. I like that I can get software from an authorized hub, much like with a package manager. I like that the releases of the apps in the hub are mostly well documented.
But no matter how nice Flatpak seems to be, its overreliance on “portals” and “buses” and “seals” comes associated with trying to over-engineerize my system too much for its own good. Every app I have ever tried on Flatpak, for example, doesn’t support audio, apparently because I have the godly, eternal, battle-tested ALSA and not the manchild’s crap that is PulseAudio. But since apparently PulseAudio is the GNome / Microsoft approved way to do audio on Linux, I’m supposed expected to have it. What’s next? systemd-flatpakd?
OTOH, I picked up the AppImage for Freetube and not only do I get audio but it loads and runs noticeably faster than the Flatpak version. And since it’s an official release I know where can I trustably get an update from. Literally no downsides!
But I sure as hell am not going to go for an AppImage for an app from which I expect more integration with my desktop activity, such as say a code editor or an advanced image / model viewer. Not if I can help it. Because I am going to be expecting to be able to stuff like drag and drop, have a correct tray icon, etc.
So that means I have to keep an eye on both solutions.
Hey, at least I’m avoiding Snap!
Now if there’s an AppImage for Steam somewhere… maybe…
What, no Android USB tether? It’s been native since Debian 6 IIRC.