OTR has been on XMPP for so long now
If there's one thing we learned from Snowden is that the NSA can't break PGP, so these people who live in the world of theory have no credibility with me.
I never saw a single speck of anything I ever sent to anyone via PGP in there. They had access to my SIGAINT e-mail and my BitMessage unlocked, but I used PGP for everything on top of that.
Stay safe!