My main note tool for years has been Obsidian (using Obsidian Sync on Linux, Windows, Android, and iPhone). Works great for regular notes.

I don't think it's very good as an outliner, though I haven't tried the recent outliner plugins, so maybe things have improved. I do my outlining with org-mode on Emacs because of my dissatisfaction with Obsidian in that area and lost data on Logseq.