The height of the stool you choose mattes because you will be using it in a variety of places. You need to take into consideration the height of your child and that of the stool. If your child is still young or on the short side of the growth curve you will want a taller stool. A taller stool will prevent them from always having to be on tiptoe to reach the sink or a snack. If you have a child on the taller end of the growth curve they may benefit from a shorter stool so they are not stooping to wash their hands or reaching too high on the pantry shelves. If you have multiple children of differing heights you might benefit from a multi-step stool. Yes, stool height matters. Use your judgment to pick the stool that best fits your family.