I'd definitely say its the quality of the work experience and what you learn from it. When I was doing my short stint in A&E, one of the consultants said to me "You're not doing the work experience to learn medicine, that's why your going to medical school". You want to be doing things where you can learn how things are run, as well as things like "communication skills" and getting a fair idea of what your life is actually going to be when you (hopefully) become a doctor