On the street, mushrooms have a reputation for being much more gentle than LSD, and LSD is supposed to be more pushy (ie. LSD will make you face your issues, while mushrooms might just invite you to do so). But it's questionable how strong a dose of mushrooms those who maintain it's more gentle than LSD actually took.

Also, a long time ago I read of studies that showed that even experienced users couldn't tell the difference between all the various major types of psychedelics when they were administered in a double-blind fashion.

Something else to consider is that, as I've mentioned in another comment, a lot of what's sold as LSD on the black market actually isn't, and most people don't test their drugs. So much of what you read these days about self-reported LSD use is probably actually about other substances.