I've had one full experience with dmt. It was enjoyable but incredibly overwhelming. I was with a group of friends having a session, and after dosing and laying back, I became very concerned about my ability to breathe, and uncomfortably aware of the presence of others. Overall it was very interesting, but next time I'll likely do it alone.
I'm not sure what I could call my favourite. I have the most experience with lsd, which I do love, but 4-ho-mipt and 2c-e might contend. I'm also a big fan of dissociatives, especially in combination with a good psych.