Org-mode vs AsciiDoc

Org-mode is characterized by a flexible and versatile system with adaptability to different workflows, making it comparable as an Evernote alternative. It is at once simple and complex., which helps it to compete as an Evernote alternative.

Org-mode has some built-in agenda functionality. You can schedule tasks and assign various degrees of importance to each of them. Org-mode agenda can also be synced with Google Calendar.

Org files are plain text, and lend themselves well to version control. Emacs also has good integrations for various VCS.

Notes and to-dos can be synced with Trello, Toodledo, Simplenote, Orgmobile, or with tools like Git on Github, Dropbox, Google Drive, and Bitbucket, while WebDAV (with iOS and Android) can also be exported to PDF, mind map, LaTeX, HTML, Docbook, or txt.

Org-mode has some basic spreadsheet functionality. Other than auto-formatting ASCII tables (a notoriously annoying problem), it also has support for LISP-like syntax to define equations or any other functionality that can be achieved through spreadsheets.

Org-mode has out-of-the-box support for Latex: it can immediately parse equations (or other Latex markup) and can even compile notes to PDF or HTML.

The formatting of Asciidoc is standardized so there is only one 'flavor' unlike in Markdown. The definitive user guide is here.

Simple, easy-to-read style similar to Markdown. Designed to be easy for a human to enter with a simple text editor, and easy to read in its raw form.

The DocBook format which Asciidoctor can convert to was originally developed with the creation of computer books in mind and thus has a rich array of formatting options which are powerful enough to manage the formatting of lengthy technical books.

Both GitHub and GitLab support AsciiDoc syntax in repositories, wikis and Gists/Snippets (powered by the Asciidoctor Ruby gem).

Cleanly transforms to DocBook and HTML5.

AsciiDoc has offered the ability to define both the color of any text output as well as its background, almost since its inception. It accepts several standard chromatic notations for them, too, including hexadecimal and decimal RGB values, decimal HSL and named CSS.

The AsciiDoc standard defines a number of metadata values which can be defined inside a document primarily for contextual purposes that aren't rendered in its standard output such as author, date, license, document title and version, etc. These can be especially useful when searching through a large number of files/documents or documenting the evolution of one as part of a larger codebase.

There are plugins to support editing AsciiDoc for many editors/IDEs.