I think Notion is more aimed at teams. I haven't used Athens or Roam, but certainly Obsidian and loqseq are much more single user focused. You could use a share

I think Notion is more aimed at teams. I haven't used Athens or Roam, but certainly Obsidian and loqseq are much more single user focused. You could use a shared sync but it requires the end user to have the same sync program as you, so it's not like sending a link to someone involved