If I were you, I would split loyalties. I've been (only) GM with DL and my upgrade success rate has been about 95% over the last year on eligible fares. Same 100% bonus as PMs. Only difference in my mind is the free CRC membership.

Perhaps, you should stick with DL for this year, wait for the AA - Qualiflyer partnership to come to full fruition and split loyalties next year??