I've heard this many times and there is definitely some truth there, but for small doses (i.e. 100ug LSD and 1-1.5g mushrooms), I don't think you need to overly-concern yourself with minutiae of the differences.
There is no reason to take more than this as introductory doses, and then you can make up your own mind.
There is no reason to take more than this as introductory doses, and then you can make up your own mind.