What I've learned about curriculums along the interview circuit includes:
-Block : where you take 1 class for a month to 6 weeks, as well as a year/semester long clinical skills class, and probably a lab.
-Semester : like most undergrad, you take 4-6 classes/labs and have tests in all the classes at any given time, sometimes with one big testing week every month or two. You take classes like anatomy, physio, histo, pharm
-Integrated (or systems) block : you take 1 class at a time, generally looking at like an organ system or like a histo/anatomy or a "host defense" class in micro/immuno/pharm... No standard classes like the semester style, it's all mixed together so you learn about the anat/physio/histo/pharm/path, etc of the cardiovascular system, and then you do that again, for like the nervous system, or the renal system.. Oh and you still have a lab and a clinical skills class.
-Problem based learning: You can have this with block, semester or integrated, and this is a less lecture based system where you work in teams with a moderator w/ a case study and study the whole process of diagnosing from history to differentials to drugs to treatment and so on. lots of critical thinking.
-Lecture based: typical go to class kind of deal... like most undergrad work done in a lecture hall.
-Practice based: lots of hands on stuff, lots of review.. I don't know much about this.
I don't personally know the pros and cons for you, because like some people love problem based and others think it's awful. it just gets down to how you learn best and what makes the enormous amounts of info stick.
again, I'm not a student yet, so this is just my outside opinon from what has been explained to me.
Good luck in your studies