Briar is peer to peer via Tor. This has pros and cons.

Pro:

-Everything stays on your local device

-Uses Tor Onions to avoid government domains

-It can do bluetooth to bluetooth, for like an in-person protest for example

Con:

-UI sucks

-Other person has to be online

-You can use mailbox drops to host a server, but then it’s really just like XMPP over Tor

-Group chat user interface is horrible and confusing