Quiet seems OK, similar attempt to Cwtch, but like all of these it needs more testing to trust for anything significant. As it stands I only consider Briar & LoRa stuff like using LXMF trustworthy.
Session suffers from all messages persisting forever across effectively a federated message routing network, piggybacking on some barely recognizable cryptocurrency. Inadequate long term secrecy guarantees to me. The foundation for it is also Australian.
SimpleX seems to have ties to Israel and its founder is cagey about it. It can route over Tor for everything. It's not really worth considering it for me, but if you do trust it completely you should probably self-host the server for it via Tor and not federate them.