Notes vs Obsidian
Notes is perfect for when you need to note something down quickly. It's very basic, which can be both a good and bad thing.
Obsidian is mostly known for its powerful note-linking abilities. You can easily build and navigate whole knowledge bases with Obsidian. That said, it's definitely more complicated and less aesthetically pleasing than Notes.
Fan of minimal note-taking apps? 🤔
Maybe Paper is what you're looking for.