We all need cacti!
;)

Trichocereus bridgesii

Are high in alkaloids and often contain a MAOI to kick things up a notch or three as well. All the plants in the second pic except the one at the back left are bridgesii or bridgesii hybrids. These typically have few spines but the spines they do have can be massive.

Trichocereus pachanoi

Is a bit milder (depending on dosage) & sometimes more enjoyable for someone new to the cactus experience. These are possibly the least hostile to handle as well because they only have short spines. There's one pictured at the back left in the second picture in the post above and the tall plant in the first pic is variety of pachanoi as well.

Trichocereus peruvianus

Can go either way, they can be very good or complete bunk depending on the particular specimen. They are heavily spined and quite hostile to handle.

Thanks for the interest man, I really appreciate it. I'm following you too.