Always bet on text
People can read much faster than they can speak, and they can google a new words.<p>You can Ctrl+F arbitraly big text files for keywords. Good luck with doing the same with 2-hours-long video file or mp3. You will need to listen to the whole thing. That's what annoys me about the new trend to do tutorials as video.<p>You can easily diff text.<p>Text works with version control systems.<p>Text works with unix command line tools.<p>You can trivialy paste relevant fragments on wiki pages, in emails or IM discussions.<p>Google translate works with text.<p>Screen readers work with text.