I played with Logseq a bit as an alternative to Obsidian, or complement for it.
Logseq seems like a simplified version of Obsidian that does less. For many people that will be a plus. Fewer options equals fewer things to fiddle with and potentially break.
Logseq is an extreme outliner. It wants everything you do to be an outline. Obsidian supports outlining, but Logseq is more opinionated and more powerful as an outliner. That’s a minus for me; I do use outlines but mainly I just write prose.
Logseq wants you to limit yourself to store everything in just four folders, and organize all your data using links instead. My brain doesn’t work that way. I make heavy use of folders.
Logseq is open source, which makes it—possibly—more futureproof and secure than Obsidian.
I don’t think I’m going to stay with Logseq. It doesn’t seem to be different enough from Obsidian to be worth the hassle of switching.
Still, Logseq seems to be a great app for people who are looking for an extremely powerful outliner. And I may come back to it.
And playing with Logseq gave me some ideas for doing a better job of organizing and using my Obsidian vault. I need to use the Daily Note more, and move blocks of text between notes using the Text Transporter plugin
Update: Elsewhere, someone suggests using Logseq for transitory notes and Obsidian as a more permanent archive. That seems intriguing. My Obsidian vault is a mess, a hodgepodge of transitory notes, important documents, and notes for completed projects, some of which are for former employers and therefore extra-dead.