In short, Scoop installs all your apps in the user home dir. Apps are not installed through an installer, but through a .zip file. A pro is that you do not need to be admin on your PC for Scoop to function (handy for PCs that are not in your control). A con I've encountered is that Windows is not very friendly towards apps that are not installed through an installer. I've installed IrfanView through Scoop, but for some reason, Windows restores "Photos" as default app for opening pictures a few times a week, this was not the case when I installed IrfanView with an installer.
Multicomp|5 years ago
This may not be Scoops fault. I installed Irfanview with choco and have to reset my default programs setting every so often, presumably since Windows 10 takes user settings as suggestions for the Microsoft PM to ignore every few weeks when the OKRs get thin :).