I wrote a favorable article about Montessori entitled: Montessori, Waldorf, & Co-op: Why a Preschool’s Philosophy Matters. https://wehavekids.com/education/Montessori-Waldor...
These three types of preschool are exceptional because of their robust philosophies. While each one is unique, they all have a framework that shapes their program. Everyone--administrators, teachers, parents, and kids--are on the same page and share a common goal. These remarkable preschools have an identity and a purpose that sets them apart from today’s academic preschools.
What I warn parents about are preschools that have no philosophy at all. Many, especially so-called “transitional kindergartens,” just aim to prepare kids academically for kindergarten. Without a framework to guide them, teachers fall into the trap of pleasing parents. They’re loaded with activities that easily impress moms and dads but aren’t developmentally appropriate for young children such as long circle times, teacher-directed lessons, and step-by-step craft projects.
These adult-centered programs are what parents need to avoid. Montessori, Waldorf, and co-ops are all child-centered and, therefore, are all good options. Thanks for the question!