Interviewing with who?
Interviews fall into two categories: informative and evaluative. Along with that, they may be conducted by admissions staff, alumni, faculty, or even students. Some interviews occur on campus, others via phone and some even use Skype. My personal preference is with an admissions representative, whether on campus or when in the area. Face to face is always preferable to worrying about the logistics of technology. An interview is just another opportunity to add another dimension to your application, so why wouldn't you?