Based on my personal experiences with caapi, Syrian rue and Moclobemide as MAOI's, I would recommend caapi above and beyond the other too. Caapi is obviously a very important component of the authentic ayahuasca experience, and I find it much more purifying than the other to, with a great afterglow, it feels much smoother on my system than rue, and is much more grounding and guiding than Moclobemide. It also allows me to purge which can be especially beneficial when things are getting a bit too much with the DMT...I simply can't purge on rue or Moclobemide, and it is great to have that caapi purge safety net. I've yet to smoke changa on aya but it is very high on my 'to do' list!