Skis and boards gain stability and glide with increased base area. Wider shorter skis will not only glide fast, but also give you much better stability in most snow conditions. The guy with the big fat board, be it one or two, spends less time edging. Snowboarders ride the base more, and pressuring the edge less. Take this approach to fat skis, weighting them evenly, and you ll cruise effortlessly through the roughest snow.
Fat skis can carve medium to long radius turns well in soft conditions.
It becomes pretty obvious how to adapt when you get on em. Just put on your helmet and disconnect the brakes you ll have all your friends sold by nightfall. Consider your priorities when choosing ski width. As with side-cut and weight, there are pros and cons to narrow vs. Fat skis. Again, just get the ski for the condition you prefer, or for a specific task.