If I was going to be stranded on a desert island, and I could have a single box of one or the other, I would choose the Opus X. Not for the reasons you may think though. I actually prefer a properly aged CC to a properly aged Opus X, same goes for young of each. But, if I know I only get ONE box for the rest of my life, I'm not taking a chance that several sticks in that box aren't even smokable.
That is where the Opus X shines over CC's, their smokability percentage far surpasses any CC. I love CC's, and many of them are my favorite smokes, but sometimes their rollers can cause more frustration than enjoyment, not everytime, just sometimes.