Session is better in the sense that it doesn't require a phone number (it uses public/private keys afaik) and it routes messages over Tor.
Not using phone numbers is great, but routing over Tor is a bit performance hit.
Briar is interesting because it can work via bluetooth.
try keet.io
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Looks cool ...
... I guess the only thing I want that I didn't see, but should be possible with such a system, is the ability to have distributed websites ... like retroshare or zeronet
