Hi Jonathon,
Well of course I'm totally biased, as Rick White and I worked our butts off creating Total Boat Handling, but let me give you a synapsis.
The answer is, you may want both. If you really want to learn how to sail fast, the correct way, then buy Total Boat Handling. It's a great video, and hopefully others who have purchased it will chime in.
However, don't buy Total Boat Handling expecting that you will get a video that shows you how to rig your boat. That may be where Catamaran Sailing, a Step by Step Guide comes in.
Rick and I were convinced that we could make a better video about sailing technique, and we believe we have done it.
Good luck!
Tim Johnson
Executive Producer of Rick White's Video Sailing Seminars