I have found from experience that the video is one form of knowledge storage and a great book is another. I have been working with both types. I find under pressure while meeting a deadline if I hit a point where I need to look something up in order to achieve something in my DAW, then the book is great way to find that information and fast.
I know that Sonar has some great books. Studio One does as well. There are three in fact. The index usually points you directly to the relevant areas quickly. The manual for the software is a pretty decent store of useful info. I know the Sonar manual is very big of course. The Studio One manual is smaller but manageable.
The video is great when you have time to want to learn something new and special about your program. You go into it in that frame of mind. All the Groove 3 tutorials for Studio One are excellent. There are four of those and they are all well worth having. I find it hard to find very specific information in a video or a series of videos for that matter. Unless you know them backwards and know every little detail about what is covered in any given video.
You can have a session running of course and the video all works better when coming off a second computer. I find the book great too and well worth the investment. The book is great reading even away from the program. There is still so much to learn from the book. The Studio One books cover a lot of info that is not in the manual or the Groove 3 videos! They all compliment each other well. There is the issue of books keeping up with software updates but then the DAW website tutorials and news often covers those areas very well until a new book volume is released to cover major upgrades.
There has never been as much information been made available for our respective DAW's than now. It is a very exciting time for knowledge sharing. It just requires the user to also get excited about finding out as much as possible and different ways of retrieving that information.