Signal and jmp.chat apps (Conversations, Siskin IM etc.) Which one is safer?

I am wondering which message app to use. With emphasis on security and privacy. Since Signal requires a phone number, I will use the phone number generated by NextPlus etc. instead of the host phone number. Which is safer compared to the jmp.chat app? Snowden uses Signal,

4 posts were merged into an existing topic: Which is safer, Signal or Wire?