Inquiry-based has been researched and proven to the best for all children. Montessori I have found is the best education possible for a small group of children. Most kids will not do well in that setting.
I've only found a few schools in the area that use this model as it requires HIGHLY educated teachers in a very small setting with typically more than one teacher in a room. 3 is optimal 15 students three teachers.
It's a very flexible model, so when kids just need time to be kids, they let it happen. Lots of intentional play so kids learn how to play with one another. I cannot say enough about the long-term effects of this model on academic success, personal growth, motivation, and more.
Here are two examples in MoCo
http://www.senecaacademy.org/
http://www.cesrockville.org/