For me the big reason I switched is the first two. Installing locally to a single path makes for a lot less messy filesystem, and I don’t have to go admin to use it.
Also frankly, Chocolatey’s repos have become a mess, full of broken and untrustworthy software, and I just do not trust giving it admin permissions anymore. I don’t know what it is about windows software distributors that seems to lead all of them down this road, but I hope scoop can hold out...