Always bet on text
People can read much faster than they can speak, and they can google a new words.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.You can easily diff text.Text works with version control systems.Text works with unix command line tools.You can trivialy paste relevant fragments on wiki pages, in emails or IM discussions.Google translate works with text.Screen readers work with text.