I couldn't decide myself whether to go with black or brooklyn grey. You can never go wrong with black and there is probably a higher demand for resale, but the grey stands out more and is more bold imo. After watching the videos, it was clear to me that I would go with brooklyn grey (compare the pictures). The car looks much sportier and the contours stand out more. In addition, the black details on the car stand out a lot.
I am very happy that I ordered the M3 in brooklyn grey and can't wait to pick up the car.