I think I'm going to buy the Comp Carbon, because I don't need Di2. Accepting the good idea of Jodi2, I will put some elements of the Expert: the Roval C38 carbon wheels and the Shimano XT cassette. I will put aside the original Carbon Comp wheels and cassette which can later be used for gravel. I have a question: I guess Roval C38 wheels will already come with brake discs. Will they be compatible with the Comp Carbon brakes? Thank you for your answers.