Flatpak’s the only one I’ve had good experiences with. Tangentially related, but I especially dislike AppImages. I’m not a fan of how bulky installing various flatpaks ends up being and use native packages or the AUR usually, but beyond that they’re really convenient for non-critical applications that otherwise would mesh poorly with my distro or aren’t available there. Friend of mine tells me it’s also a nice system to package Windows applications/games with a preconfigured Wine version.