As someone who've followed the matrix/riot developments for the past couple of years - the main thing to keep your eye on is this:
>Declaring End-to-end Encryption stable and turning it on by default for private rooms. (12/14 tasks completed):
The last statement (March 18) from the devs reads:
>We're roughly a few weeks away from releasing this to the stable channel, but that may change if we uncover new areas of the project that we feel must be fixed before release.
>The team is working hard on this, and we're excited to share it with everyone when it's ready.
When it's done I'd say matrix is the clear winner. Jami still has some bugs but will eventually be very good as well. Jitsi is the more stable one out of the three that's just a bit more messy to set up (that's why it's not recommended that often, similarly to XMPP).