I currently use Obsidian for notes, I really like the canvas function this has to map out ideas and projects. Didn't know HelixNotes, looks promising (and opensource, which Obsedian is not) I don't have a automatic connection between Obsidian and Linkwarden. I use Linkwarden for temporary storage and import the text/images into Obsidian via the browser plugin. Its a constant workflow for me so not a lot of buildup, but context deffinetly matters.