You should write a wiki article when:

• Your content is "living" and it evolves on a regular basis (e.g. a how-to article gets updated whenever new features are developed and released).
• You have to incorporate other media types within the content (e.g. a video).
• The content is a repository of information (e.g. a repository of customers, addresses, etc.).
• The content within it should be easily accessible for copy/pasting purposes (e.g. I should be able to easily copy/paste a biography).

You should upload a document when:

• Your content is a corporate template (e.g. a powerpoint template).
• The content is a recording, a video, an image, or a graphic.
• The information must be easily downloaded and shared with a third party (e.g. a user guide, a technical brochure).
• Your audience must be able to access the content using the Desktop App.