Answer: 
It depends how often you are using Walkstool, where you use it and how much money you want to spend. If you want the best in the world with highest quality and seat comfort, you should choose a Comfort model depending on your height and weight. If you are slim Comfort (40% bigger seat size than normal) 45/18 and 55/22 could be the best choice even if also slim people love Comfort 65/26 if they are tall (80% bigger than normal) due to seat comfort. On wet grass or out in forest Comfort are outstanding due to bigger rubber feet that minimize risk of sinking down. Basic models have the same concept with telescopic legs of aluminium and same weight. The main differences are smaller seat seat of polyester and normal plastic feet. At the same time is app half the price which means that many people prefer to buy two Walkstool Basic instead of one Swedish model. If you don't want to spend the money the Swedish models cost but want the concept with telescopic function and bigger seat size (20% bigger) than normal 3-legged stools and good quality, then Walkstool Basic is a perfect choice.