As an undergrad, I've taken classes that had IDM students and MDE students in them. From my general (and very cursory level) impression, it seemed that MDE students were better at systems level thinking focused on designing for specific topics they were passionate about (which lines up with what was said above) while IDM students were more focused on making and producing. I know there is generally some sort of winter sale IDM students do with their projects, which I think shows the entrepreneurship spirit of a lot of the students there.