Hey, I am in Drexel's Post Bacc (IMS) program now, which mirrors the first year IFM curriculum. IFM is traditional classroom lecture learning. There are a series of module guides for the year where professors distribute their lecture notes. In class they have slides/other visual aids to facilitate explanation of what is laid out in the module guide. At the end of each module there are exams in each of the courses present in the module.
PIL is their problem based curriculum. It is about 40 students, and they learn primarily through research rather than through lecture. There is a facilitator who makes sure that the students learn what it is they need to know for each unit, but for the most part the students are on their own. At the beginning of a unit the class is given some information about a patient's condition, and it is the class' job to figure out a diagnosis based on available information and then decide the proper treatment. Each person in the group (5-6 students/group i believe) is given a task to complete over a certain amount of time, and at the next session they have to present their findings. Also, at each meeting, a little bit more information is given about the patient to steer groups in the right direction.
For an independent learner I would undoubtedly suggest IFM. All the lectures are taped and available on the web so if you miss one or want to come back to one you can always watch it later. Labs have group work, but none of the lecture-learning requires any dependence on groups to get the job done. PIL is a program for people who learn well in small groups.
hope this helps.