OneNote vs Obsidian
Both OneNote and Obsidian are powerful note-taking apps that can be used to link together notes.
OneNote is a powerful note-taking app, supporting a wide range of ways to capture and organize various notes, todos, and ideas. Though it supports linking, that is not its strong side. With OneNote, you can capture notes in any format, from any place, and on any device, with seamless syncing between them.
Obsidian is based on linking together plain-text Markdown files. It is a lot more sophisticated in its note-linking abilities than OneNote. You can easily build and navigate whole knowledge bases with Obsidian.
Fan of note-taking apps? 🤔
Maybe Paper is what you're looking for.