Whereas style is about form, need is about function. Whereas style is right brain (subjective and intuitive), need is left brain (objective and logical). Need is what most people think of first when they consider a window fashion. Does it provide privacy? Will it prevent heat from escaping during the cold months and retain cool air during the warm ones? What degree of light control does it offer?
To help you sort through and prioritize these and other needs, we've outlined key functional considerations here.