I use vimwiki, and I'm really liking the simplicity of plain text notes (markdown in my case). I've never used orgmode, but I prefer to use other tools for to-dos and calendar/organization anyways. From reading about it, I think the only feature I'd really like to have is literate programming, which looks cool. Also, the tag search appears to support expressions, which vimwiki doesn't.

One area that I'm struggling with is making my notes easily viewable, editable and searchable on mobile. Syncthing + Markor for editing takes care of the editable part, but they aren't displayed nicely or easily searchable by text or tags. Exporting to HTML would make them nicer to read, but still not searchable. App and browser based solutions are much nicer in this regard, but I'm not willing to compromise on the other great benefits of programs like vimwiki/orgmode.

If you or anyone else has experience or an opinion, I'd be glad to hear about it.