Ah, my PKM quest leads to me, Tana. Today I got early access to Tana. We can only gain access by invitation.
Tana has a relatively short learning curve. I did not explore Super Tag; that is a game changer.
People consider Tana to have both Notion and Obsidian features. Notion is cloud-based, while Obsidian is file-based. The major feature for Obsidian is Graph View. You can interlink your notes and create a map based on them. While Notion has power of database (not TSQL,PLSQL). With Obsidian, I am limited to accessing and making notes solely from my laptop. There is a Sync feature in Obsidian, but it is less used.
This video represents my first experience with Tana.