R.
As a student, St. Christopers was kind enough to allow my class to come in and practice giving assessments on the kids (with parent permission of course) they are VERY nice. However, the facility itself isn't that impressive. It's not a completely true montessori approach but their are A LOT of teachers and a low student to teacher ratio. The classrooms are very large and staff was friendly. I've also heard GREAT things about the JCC and I have in the past been a nanny for kids who participated in other programs there and I've never heard one complaint. I think either choice is a good one.