They are two very different systems,
Auto Vox
Auto Volume
Music fader
Seperate master rider and pillon volume controls
VOX LED
power LED
More aux sockets
12 v only for the power
Slimmer
Also on your other post if you are looking at a Super Pro or Pro-7 be safe and run a Kenwood TK3201 or TK3101 which can also be powered via either system. Any foriegn radios will either be on completly different channels to what we use over here, or the the tone settings will be different. If you need more than 1 mile between the bikes why are you actually riding together??
Rich