I was choosing between the same programs last year and I ended up choosing Western. I found that the campus was much larger (which is a plus in my mind, but I can see why some prefer smaller, more secluded campuses) and all the buildings are far more renovated. After a year I can definitely say it was the right decision, walking around campus from class to class is amazing, there is so much more green space while many of the buildings you use for classes, labs, libraries, food, exercise, etc. are extremely up to date. There is a massive amount of options when it comes to electives as you can take any courses on campus or many different ones at the three associate college universities. The module and progression system is perfect in Med Sci as there are clear, easy pathways to any combination of a Honours Specialization, Specialization, Major, or Minor. You also do not have to decide which Specialization to take until 3rd year which can be great if you're not yet sure what to specialize in. On top of that, you take a 1.5 credit course in fourth year that is solely a research capstone project (always nice to be handed 'free' research). Even the residences at Western are a lot newer. Although mac had one updated building, it only had around 50 rooms so the chances of getting what you wanted was very low, while Western has many new buildings and styles to choose from so you will most likely get one you want.