Last time I checked the Snap Store was proprietary. While you could modify the Snap client, you can’t host your own store and you’re at the whims of Canonical for which apps you can get.
Meanwhile, both the Flatpak client and server are open, and you could (and some distros do) host your own repo. For example, Fedora has its own repo for Fedora-packaged Flatpak apps alongside Flathub.
Last time I checked the Snap Store was proprietary. While you could modify the Snap client, you can’t host your own store and you’re at the whims of Canonical for which apps you can get.
Meanwhile, both the Flatpak client and server are open, and you could (and some distros do) host your own repo. For example, Fedora has its own repo for Fedora-packaged Flatpak apps alongside Flathub.