It’s well known that NSA and also maybe others have already broken encryption algorithms in many applications. idk about Signal tho.
Simplex is the only one I would recommend out of those
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Jami is based on a ancient broken codebase and it lacks a security audit
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Session has several issues but most recently the screwed over the people who were silly enough to buy crypto.
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I have never heard of Cwtch so that rules that out
Imo, I think Signal is a good “normie-oriented secure messenger”, but I think Simplex is more worthy of focus.
The only one I trust is Briar.
I convinced my non-tech nerd partner to switch to Matrix and it’s been working suprisingly well for us.