First, the Stillwater Boats use only four pieces of wood for the basic hull. Fewer pieces mean less time. There are also fewer joints to work, and possibly fail, over the long term. Secondly, there is very little fairing work to do, unlike a stripper where the whole boat has to be sanded inside and out in order to fair all of those little strips into each other. Thirdly, the finishing process is much easier without all the edges of a lapstrake boat to deal with.
All methods have their advantages and disadvantages.
What Stillwater Boats offer is a quick, lightweight and simple method that results in a nicely shaped hull. The Sunrise is built as a double-paddle decked canoe. The large cockpit has plenty of room for two, as well as the picnic basket. This is the type of boat that I prefer for camping. With my heavy gear forward and myself in the stern seating position, an all-day paddle is a pleasure.