Gold ! I have this one and it is gorgeous ! Colour goes with every outfit (by the way it is more champagne than gold), and goes well for day and night.
I posted a picture in the thread "what Gucci are you wearing today ?"
Good luck deciding !
I was in the same boat 2 weeks back and went with the blue! Thought I would get more use out of it and don't have to worry about color transfer. The blue is gorgeous especially in sunlight!