For me it’s Flatpaks at the moment. Adhering to FOSS means that I try to avoid Snap. AppImages are pretty good, since it’s just an executable (and I think there’s an AppImage updater as well?), but Flatpak is preferred for me since I like the idea of having containerised systems because it’s easily manageable under this sort of central manager, i.e. Flatpak. I typically just install everything using Flatpak and update through that.
For me it’s Flatpaks at the moment. Adhering to FOSS means that I try to avoid Snap. AppImages are pretty good, since it’s just an executable (and I think there’s an AppImage updater as well?), but Flatpak is preferred for me since I like the idea of having containerised systems because it’s easily manageable under this sort of central manager, i.e. Flatpak. I typically just install everything using Flatpak and update through that.
I found AppImages to be slower than anything else.