This department is one of the few places where a particular research is done and they have got more than 81 publications. The research team is really good and recently my masters supervisor told me it is the right department in a wrong university.. Also they offer full scholarship.
In years to come, many people will ask who your supervisor was and who appraised your thesis. On that basis, it makes sense to try to get a supervisor who is well known in the field. So ditto earlier remarks - supervisor first, uni second.