The assumption that rational choice dynamics will lead to diversity of school supply is at the heart of K-12 school choice arrangements. Yet as the field of school choice becomes more established, there will be the "inexorable push toward homogenization." If vouchers, tuition tax credit scholarships, and education savings accounts become more significant players in the education market in the years to come, isomorphism, if it occurs, will limit the utility of school choice. Drawing on experiences from the charter sector and the Louisiana Scholarship Program, this article considers whether education savings accounts might encourage less isomorphism of practice among participating private schools than school choice options such as vouchers and tuition tax credit scholarships.