A Phone System is a Simple peace of equipment meant to help streamline business communication whether internal or external. There are many different types of Telephone Systems out on the market today. Most have basic Business features such as paging, Intercom, Call Forwarding, Auto Attendant, and Voice Mail. There are no real differences between Analog Or Digital Phone Systems. Each has its own set of features. To figure out which is better for you is simple. What features are you looking for? For example if you go with the Panasonic Analog Phone System KX-TWA848 you can ring groups (meaning multiple phones). IF you go with the Digital & Analog Phone System KX-TDA50 you can also ring groups but you can also give each phone line a distinct phone ring which you can not do with the KX-TAW848.