Org-mode vs Nirvana : Which is Better?

Org-mode

Org-mode is an Emacs Mode for Notes, Planning, and Authoring. Developed by Carsten Dominik

License: Open Source

Apps available for Mac OS X Windows Linux Android iPhone

Nirvana is a cloud-based task manager that isn’t just about doing more.

License: Freemium

Apps available for Online Android iPhone Android Tablet iPad

Feature	Org-mode	Nirvana
Command line interface
Emacs integration
Customizable
Export to HTML
Extensible by Plugins/Extensions
Hierarchical structure
Hierarchical tagging
Infinite hierarchical depth
Lightweight
Notetaking
Outline mode
Outliner
Plain text file
Portable
Privacy focused
Publishing
Search by tags
Tag based
Task Management
Todos
Web-Based
Share notes
Works Offline
Photo notes
Sync on many devices
MarkDown support
End-to-End Encryption
Cloud sync
Encrypted Notes
Database
Visual bookmarks
Custom templates
Wiki-like interface
Export to LaTeX
File Versioning
Alexa integration
Dropbox integration
Favorites
Gamification
Export to OPML
Support for Keyboard Shortcuts
Distraction free writing
Tracking of characters
File-organization
Clean design
Full text search
IFTTT integration
Gmail integration
Google Calendar integration
Recurring tasks
Collaborative
GTD-based
Real time collaboration
To-Do management
Protected by Password
Dependency Tracking
gmail.
Support for Kanban Boards
Double Donut Chart
Kanban boards
Self-hosted in intranet or private cloud
To do lists
Subtasks
Team Collaboration
Calendar view
Calendar integration
Customizable Themes
Things is polished almost to perfection
Convert Email to Task
Project Dashboard