Simplenote vs Obsidian
Simplenote 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 a Markdown-based note-taking powerhouse with excellent note-linking abilities. You can easily build and navigate whole knowledge bases with Obsidian.
Fan of minimal note-taking apps? 🤔
Maybe Paper is what you're looking for.