Logseq, Athens and others uses outlines (Markdown unordered lists) at their core with files being more of the backing store. Obsidian uses plain markdown files.

Logseq, Athens and others uses outlines (Markdown unordered lists) at their core with files being more of the backing store. Obsidian uses plain markdown files. There are Obsidian plugins that provide similar support but it's still for the most part obvious that the notes were written on Logseq.