Back to the original poster's question about Montessori vs. Waldorf at the preschool level, I would say (though I'm no expert, I've just read a bit about both):
Both are basically child-centered programs which try to encourage order, freedom, and independence. You can find individual schools that each warp this in some way--Waldorf by being so sure of it's theory that it doesn't adequately allow/encourage differences among children, Montessori in that some have become more competitive and abstract/academic than the theory allows, usually due to parent pressure. Good programs in each will have supportive, caring teachers, an inspiring aesthetic to the space, lots of freedom for children to pursue their own interests.
Differences tend to be:
Aesthetic--both have organized space with lots to play with, usually a lot of wood, child sized furtniture, and the freedom to move around. But Waldorf will usually have more of a fantasy/watercolor children's book illustration look to it with pink walls, toys that still look like the branches they were made from, dolls, colored silks for decoration and dress up. Montessori is actually even more varied, but has child sized everything with more focus on puzzle-type things, activities set up in little trays, graduated rods and blocks, matching activities, activities that encourage phonemic awareness (like baskets of items or groups of pictures whose names all start with the same sound). Both ideally make use of both indoor and outdoor space.
Learning goals: Waldorf pre-K will tend to have a circle time with stories, puppet shows, fingerplays, songs and/or seasonal poems; time and materials for child-initiated fantasy play; time outside as a group; possibly a joint cooking activity or adults prepare a snack and the children can move in and out of the food preparation as they wish. There may be drawing with block crayons. The focus is on surrounding the child with beauty and goodness and encouraging the development of their fantasy life in fairly independent individual and group play.
Montessori pre-K will have a variety of activities in different learning areas. This website may give you a feel http://www.ux1.eiu.edu/~cfsjy/mts/_link.htm
for some of the activities. The child learns either by observing an older/or just more experienced in that area child or through a brief demonstration by the teacher. Children have many opportunities to work independently to achieve new skills in self-care, language arts, foundational math experiences, etc.
Montessori schools can be lacking in opportunities for fantasy play. There aren't likely to be many dress up materials for example, especially compared to a Waldorf classroom with its playstands, puppets, and silks. Waldorf schools can be lacking in experiences that allow skill development that many kids really have a passion for--counting, comparing, measuring, weighing, being able, on a regular basis, to show mastery of a skill that they struggles with a week or a month ago. Personally, I think both are important and you may want to encourage the balancing skills in your homelife and play experiences.