I've used everything from Evernote to Emacs (primarily for text manipulation and org-mode project/task tracking), Bear to Apple Notes, Workflowy to OmniOutliner, etc. I had been keeping a lot in Apple Notes but then I must have synced incorrectly somehow because text I had written on my desktop disappeared after I wrote text in the same note on my phone, and I couldn't find a way to get it back. I've been using Obsidian (offline) and I really enjoy it.