AppImage is the clear winner on the Linux desktop for things that aren't in the repos or for users that are unwilling to engage with apt too much. AppImage provides a macOS like Application experience. Flatpak is on life support; there isn't much going on there but it still works.
> Flatpak is on life support; there isn't much going on there but it still works.
Since when is Flatpak on life support? Everybody (except Ubuntu) is pushing for it, from the regular desktop distros like Feodra all the way to image based distros like KDE Linux and Fedora Silverblue.