@tay only Signal for me, I'm looking forward to Molly's Flatline server, hopefully it will eventually support federation or something.
And someday when Fedi gets E2EE DMs.
I refuse to use anything else because people smarter than me from the cryptography field (e.g. Soatok) have written countless blog posts and articles about why XMPP, Matrix, *shudder* Session and Threema, and so on, suck, and we shouldn't use them if we give a shit about security and privacy.
Telegram is not E2EE unless you use secret chats. Group chats and regular DMs are just not encrypted at all besides standard server security. Discord is a shithole and a privacy nightmare, Stoat (was Revolt, tested it a bit back then) doesn't do much and E2EE has been on the back-burner for years.
Matrix is very problematic because only a few clients implement the latest features so it's either Element / Element X or some other client that has bad UI and doesn't support the latest features.