Ready to get a VAG-COM for my S6, but obviously need something other than the Service Maual I bought. Bentley does a nice job describing these three items, but does not do anything close to comparing them. For me, the online would be nice and easy, but is it as complete as the others? Is the CD the Repair Manual in a different format, or is there more/less?

Did a STFA but there was no definative discussion on this...