I don't claim to know the answer but flatpaks have easier distribution (flathub), package management, sandboxing, can share runtimes and are also portable in th

I don't claim to know the answer but flatpaks have easier distribution (flathub), package management, sandboxing, can share runtimes and are also portable in the sense that they work across linux distros. AppImage is a simple and even more portable format but not much else so I guess it's superior if you only want to maximize portability.