I had a glacier white S3 black edition with panoramic roof in June that I ended up rejecting. It looked very nice but it seemed to attract a lot of attention (which I didn't like). The glacier white itself was a nice colour but with the black edition bits etc, i always thought it looked a bit boy racer which wasn't for me at 48. I would prefer the grey so that it was a bit less in your face. It's all personal preference
I came from a white Mercedes c class and would definitely have white again as I love detailing and it looked great but I wouldn't have my s3 in white with black edition