- CC : V. good systems rewiev.
- MRG : V. good failure & operations rewiev.
Generally, the CC wil help you understand how the aircraft is bulid, while the MRG will help you understand how to operate the aircraft. If new to the type, it'll help you understand how to handle multiple failures and in that way teach you how the systems work, but from an operational point of wiev.
So save yourself the pain of indecision -and buy them both
