Hi Eric.
I think it would be difficult to prevent the edges of a 50cm birkin from being scruffed. So while CdC is a great looking leather, it is probably not as easy to maintain in great condition as fjord, especially the corners of the bag.
Just a thot
I agree with archangel.
I have 32 Hac in Fjord and this bag is def. a great bag for a work bag! Not sloughy either, it holds the shape for sure. This is why we called Fjord as a workhorse leather.
Good luck on your decision Eric. I am excited for you!