That being said, as Aeon alluded to, its kind of a pointless question unless you are creating an equivalency of dosage between different substances. For me something like:
This. One reason LSD, for example, is often described as being so visual is because at various points in time it has been cheap to the point of being free AND it's very readily dosed high. The barrier to eating a ten strip is lower than the barrier to eating ten linear feet of cactus. Vaping a high dose of DMT is even easier and lower commitment.
Bufotenine (5-HO-DMT) hands down, which is also my answer to best/least known and used psychedelic. Unless you are gifted in extraction you probably won’t ever see it, but it is absolutely breathtakingly visual.
This. Although it's different in character than DMT and especially salvia, I'd say that 5-HO-DMT (
NOT 5-MeO-DMT) nudges them out for the top spot in this arbitrary ranking system. It's got some of the lushest and most awe inspiring visual experience of anything I've ever had. It also has practically no headspace. And in my experience about 2/3 of people get horribly unpleasant, toxic-feeling side effects from it that dissuade them from ever trying it again. Luckily, I don't.
As for 4-HO-MET or 4-AcO-MET, it's absolutely wonderful. Light, playful, childlike, refreshing, it has a cool and energetic feel to it like a bracing early spring breeze. For me, it also has visuals of staggering beauty, complexity, and detail--all while having a gentler headspace than mushrooms. That's not to say it doesn't have a headspace--difficult experiences are still possible--but that compared to one of the
deepest psychedelics (psilocybin) it's quite mild. I find it pretty much delightful, but also don't find myself revisiting it very often. YMMV.