I'm more in favour of a dark colour for the new Z4 to disguise the 'joins' of the roof. I recently saw a white E93 cabrio and IMO seeing where the roof panels joined together looked unsightly.
I don't think its been mentioned, but the E93 has the hinges visible on the outside of the car (because of the 3rd folding section), whereas on the new Z4 its a completely smooth roof.
