Well all I can say is that in my Co we changed from Aerads to Jepps and nearly everybody preferred Aerads, even after they had time to get used to the change and come to terms with it.
We eventually got the Aerad Suppliments (Comms, Met, Time, Rules etc) back as they are so much more user friendly than the book of words from Jepps.
Apparently the cost is about the same but Jepps provide a man to go to all your aeroplanes and change the nav bags every fortnight. Aerad do not. So there is definitely a resource cost saving for the airline.