I'd put Wix, squarespace, etc. in a different category. They are classic sandboxed site builders, you can only do as much as they allow you to.

Webflow is like a modern version of Frontpage/Dreamweaver that actually spits out modern, semantic HTML and sane CSS. You start from scratch and can build anything with it. It's actually hard to use if you don't understand how HTML/CSS works, because the UI is basically just a faster way to do front-end code.