Ah indeed. It's all about performance and theory. You'll get more practical experience in a music college. you'll get more theoretical knowledge in a uni. It depends on what you want to study.
If it makes it easier to understand i'll compare it to acting and drama - if you want to be an actor, you go to drama college, if you want to study drama, you go to university.
If you want to be a professional performer, you go to a subject college, if you want to know about the subject, you go to Oxbridge