The app also allows you to choose different covers for each note or notebook. GoodNotes seems to think of itself less as a single notebook or binder for multiple ideas, and more as a bookshelf for organizing different notebooks that do different things - like, for example, a day planner, a traditional notebook, a sketchbook, or a folder full of marked-up PDFs on a certain subject.
It's not quite as smooth when writing or sketching, but it does have a more robust framework for organizing things. GoodNotes 5, like Notability, also has an Editor's Choice Award on the Apple App Store, and it functions quite similarly to Notability, with just a few distinct differences.