I don't like signal.. it requires a phone to sign up, and does not accept certain voip.
I've like wire.
Keybase looks good.
Bitmessage is not ready from prime useage, but is the only true way.
If it's important use pgp.
However with strong encryption, It is more attached to you in a way, unless you "accidentally" post your private keys some where public, not much plausable deniability.