Earlier quoted context omitted.
> PGP is a great choice when you want to be able to send encrypted messages over any channel you want. That has nothing to do with PGP. You could do the same by base64-ing an OTR session (in fact, people do that all the time). I don't like the choice of PGP because it has non-repudability. If you send me a message, I can prove to anyone in the world that you sent me the message. OTR and Axolotl don't have this proble…
> If you send me a message, I can prove to anyone in the world that you sent me the message. Only if you sign the message, right? But you can use PGP to send encrypted messages without signing them.
Axolotl and OTR provide signatures, just that they are "non-transferrable" (so to speak). Not to mention that the actual crypto is more modern.