My impression
tldr/cheat: Explains most popular arguments using as little words as possible
man: Explains the entire command using a more technical tone
info: Explains the entire command in slightly more informal tone. Can feel wordier as a result, but on the flipside it connects alternative/related commands in a logical way
This post on why lemmy.world temporarily adjusted federation abilities w/ kbin has a bit more insight, especially in the comments:
https://old.lemmy.world/post/5289864