L.Z.
I have to second a little of what Megan said... I am a public school teacher and have been since I got out of college 11 years ago. From what I understand, kids who are very bright and curious, and self-motivated, flourish at Montessori settings. However, I have also had (and still do!!) kids in public school who match this description, and after working with them for a year, I always see tremendous growth and development. I have had many kids over the years who were Montessori kids in pre-school and even kindergarten, but transitioned to public school in first grade. By fifth grade (which I teach), some of them were still having trouble with the structure of the classroom in a traditional public school setting. Montessori allows a lot of exploration and self-driven project-based work, while public schools tend to work on class-wide assignments that all kids do, with variations and modifications for kids who are both higher and lower on the spectrum. We do recognize that all kids have different learning styles and try hard to match them, as well as nurture their creativity, despite what many think!!! But one key difference is that we have standards and learning outcomes dictated by the state that we must adhere to. Parental influence and support are HUGE factors for children as they go through school, no matter where they go. Honestly, that is more important than anything. It sounds like you are just that kind of supportive parent, so I'm sure you realize this already. It depends on where you and your child feel most comfortable at this point. Good luck! I'm sure you will get many opinions on this issue, this is just mine based on my experience.
OK, sorry, but I have to add something here - there is no "old" style in my teaching, or that of my colleagues. For example, I recently engaged my kids in skits, technology projects such as "epals" with kids across the country, a Wiki, Google Earth, just to name a few. We also used graham crackers and frosting to learn about plate tectonics in the Earth's crust. No pencil and paper only in these examples. I get really offended when people think public schools just treat kids like little automatons with no mind and creativity, which we most certainly do not. Do kids have to sit and listen sometimes? YES, but so do adults in the real world. :)