Seems that most hallucinogens have similar benefits, with “more powerful” drugs having a more profound effect. Here’s a study on social learning in mice [1]. TLDR: length of trip correlates strongly to duration of treatment effect (eg 6 hour trip -> 1 week effect, 36 hour trip -> 6+ month effect IIRC).

Psylocybin isn’t the most studied because it’s likely to be the most effective drug. It’s because the therapists/grad students can work an 8 hour day instead of providing 12+ hour care for LSD or multi-day treatment with Ibogaine.

[1]: https://www.nature.com/articles/s41586-023-06204-3