Been awhile since I thought about it, but would classify salvia differently imo. Ive not touched the other stuff but salvia is more a spiritual journey/higher experience drug. meant to be taken in a certain state of mind, with positivity, friendly people to watch over you and a nice comfy place to chill/trip balls. Done it a couple times, it's like an intense shroom trip packed into 15mins, only time loses all meaning and your mind is able to peak into the adjacent dimensions of time and space and you contemplate your very existence.
Or you do it not knowing what to expect and freak the fuck out and have a really bad time. There's definitely that side I hear, but we've always had good experiences.