IMHO/AFAIK Trichocereus species Pachanoi, Peruvianus and Bridgesi are more-or-less the same once you eat them. They're pretty much just mescaline in terms of psychoactive chemicals, but maybe with varying potencies. From what I've read there's not a clear champion for potency, although Peruvianus gets most of the votes. Peyote on the other hand has a plethora of psychoactive alkyloids, with mescaline being the most (and arguably only) important one.
There is likely as much - or more - variance in mescaline content from one cactus specimen to another within the same species, as there is variance in mean mescaline content between species. And there is probably no other chemical in these Trichocereus cacti aside from mescaline that is at all trippy.