I can only echo what has already been said. I have seen both videos and as is often said "a picture is worth a thousand words"
For me, as a newbie to recording and Sonar in particular, I found both videos very helpful in their own ways. I am very much a 'show me how to do that' sort of person, so the videos have have been both informative and instructional.
The SWA is very much informative as well as showing how things are done, and it comes with a complete time sheet of all the various chapters on the video (which I believe is about 9 hours long?)
The Groove 3 Video is more of an instructional video and is presented in small 'bite sized' pieces which you can view and then go off and try it for yourself.
Both videos cover all the basics and the more in depth issues. Neither Video is a 'quick reference' tool though. For that I will turn to Scott's X2 Power book (when I get it!!)
Gary