I think it depends. Dictation is a different animal than typing. For one, you think differently than you may speak, and getting used to speaking your WIP is a bit odd at times, at least for me it is.. (don't do it in public, especially around medical professionals!
) but once you get the hang of it and the commands down its much faster IF you have an accurate program and you can learn to enunciate properly. If not, you'll spend more time editing then you would just typing it in the first place. Dictation, I can get about 2-3k more words a day than I do normally, I type pretty fast and that may or may not enter the equation and my lungs are also weak so someone else may get a higher count in dictation than I can. Also, if you tend to struggle with words or dialog this won't change that much, so it isn't a magic cure, just another alternative you have to try to see if it works for you.