When comparing Emacs Org-mode vs LibreOffice Writer, the Slant community recommends LibreOffice Writer for most people. In the question“What are the best cross-platform writing apps?” LibreOffice Writer is ranked 2nd while Emacs Org-mode is ranked 4th.
Specs
Question Ranking
Pros
Pro Ultimate flexibility
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Pro Files are usable anywhere at anytime
Users are not tied to one service provider, program, platform, or database engine.
Pro Agenda views
Pro Absolutely free
Emacs with Org-mode is free as in beer and free as in speech – that is, it costs nothing and it’s totally open source.
Pro There are a lot of extensions, for exporting to html, bootstrap, js-reveal and much more.
Pro Supports plaintext spreadsheets
Pro Incredibly extensible
There are many plug-ins for Org-mode, including Org-habits and Org-notify. If Org-mode lacks some piece of functionality, it is very easy to add it.
Pro Excellent unofficial Android app (orgzly)
Pro Quickly add rich text
Pro Efficient features for deadline organization
Pro Really fast
Pro Easy to use
Pro Open source
Pro Familiar interface
The GUI is reminiscent of Microsoft Word and just as easy, if not easier, to use.
Pro WYSIWYG
What you see is what you get when you hit print!
Pro Mouse-friendly interface
Unlike command line editors, Writer doesn't require learning special keybindings or memorizing specific commands. Every option and setting is available at the click of a button!
Cons
Con Android app isn't very good
There are several user-created apps for Android, but none seem to offer the same level of functionality as other to-do apps.
Con Unintuitive user interface
The key combinations are unintuitive and difficult to remember. This is probably because there are a lot of hidden "modes" depending on where the cursor is. Actions aren't paired with reversing actions like in other todo apps. For example, hitting shift-tab does NOT reverse the effect of hitting tab.
Con By default, a hard-to-read display
The default way of writing an outline or checklist creates a very messy wall of text that's difficult to read with no vertical spacing. You can manually add vertical spacing, but the Org operations don't preserve it. There are pretty-display modes, but you need to remember how to enable them, etc. etc.
Con Not as powerful as command line editors
This is true of any GUI WYSIWYG editor as it simply isn't possible to match the efficiency and utility of a CLI editor with an interface intended for mouse control.
Con Limited extensibility
Not many cool or interesting plugins are available.