There are big wishes for Signal to adopt the perfectly working Flatpak.
This will make Signal show up in the verified subsection of Flathub, it will improve trust, allow a central place for bug reports and support and ease maintenance.
Flatpak works on pretty much all Distros, including the ones covered by their current “Linux = Ubuntu” .deb repo.
To make a good decision, we need to have some statistics about who uses which package.
Matrix, the protocol, is quite nice.
Element, the Matrix reference client, is too complicated IMO. If everyone were to only use FluffyChat, it would be great but then FluffyChat afaik doesn’t implement every protocol feature and and you could end up in compatibility issues with Element users.
Purely as a client I find Telegram the most convenient. I think more should copy their homework from there, heck perhaps post the client to Matrix.