I feel they serve different purposes, but both are good in their own right. With the CBC program, you often get fewer compliance people, but duty specific people depending on the topic. Also, their sessions, IMO, tend to be more task and regulation driven, which gives you great take-aways and is a great value for the money!
The Compliance forum tends to be less technical, and maybe a little more theory like, if that makes sense. You tend to get more compliance specific people, a smaller group, so more one-on-on peer interaction, emphasis on not only the regulations, but also WI law changes, as well as reviews of each agencies changes and edicts since the last meeting. Also, presentations and discussions that shift away from the specific regulation rules, and often takes it to the next level: how to integrate the concepts into your organization, how it relates and ties with other rules, etc. Also, time is given to discuss best practices, actual real life application, and general peer to peer interaction, in a smaller group setting.
Again both really, good, but each do serve a different purpose.
_________________________
I don't repeat gossip, so listen closely...