Dunno if you checked out Obsidian yet, but outside of the features already mentioned, I really like the UI and plugins. You can open multiple notes at once in the same window and organize them how you need which makes referencing multiple notes/topics really easy.
Obsidian is a much better tool for connecting ideas and organizing thoughts, imo. I feel OneNote is a bit easier for anyone familiar with Microsoft products and looking for more of a bulletin board (which Obsidian can do with plugins). But even daily notes and idea dumps feel more productive with Obsidian since it's so much easier to organize everything.