I second the poster who recommended touring individual programs and not just going off the word "Montessori" in the name of a school. There are a few programs out there that claim to be Montessori, but in actuality bear little resemblance to the approach and philosophy. Something to check would be whether a school is accredited by the Montessori associations (AMI or AMS) or if their staff has had specific Montessori teaching training.
I agree that Montessori may not be work universally well for every kid or their family. But I've found Montessori to be a great fit for our family. I've had two kids go through a Montessori primary program and a third who's currently still at a Montessori school. My eldest actually started off at a "traditional" play-based preschool program, and while that school was perfectly lovely, he struggled with all the constant transitions (different activities every 10-15 minutes) and was honestly bored with the activities there. He's a sensitive, introverted, and independent kid, so I thought he might do better in a Montessori program where he'd have more freedom to choose what to work on and the opportunity to do a "deep dive" on something for hours or even days instead of constantly being forced to move on to something else with all his classmates. My instinct was right - he thrived at a Montessori school. I was a little concerned with how his younger siblings would do with Montessori because they have VERY different personalities (more social, more energetic, more... loud), but they too have done very well.
I was not familiar with Montessori at all before sending my kids there, and it's definitely different... there was a steep learning curve for me as a parent and you do have to kind of "trust the system" on what the kids are working on. But one thing I really do appreciate about Montessori is the view that children are so
capable and are naturally drawn to wanting to help and be involved and learn about the world. It was totally disarming to see 3 year olds rattling off the names of continents or 5 year olds writing in cursive or any of these little kids walking around carrying glass pitchers full of water, because it's not the kind of thing you normally would think to show/teach/entrust to a toddler. But they can totally handle it (and love doing it)! And while some may claim Montessori classrooms are super rigid and one previous poster noted kids were moving around like zombies, I have
not found that to be the case at all with any of my kids' classes or other Montessori schools I've visited over the years. It really is more like a light hum of activity with kids being busy and engaged in their tasks, freely moving around the classroom and working together as needed. Wish I could say the same about my house, ha!
That said, it's... preschool. Play-based, Reggio, Waldorf, Montessori... just find a school that you feel good about and works well for your family's situation, and I think your kid will do just fine.
Good luck, OP!