My vote goes for the 5565A, due to a more special look wearability and legibility.
I owned the 5100G and sold it with no regrets.
While the movement is very special and visually very 

appealing, the legibility was close to zero and due to the curving middle case, it was a scratch magnet.
Yes, more “flex”, but the 5565A is for “the once who know, now”