I find that sunrise has a more white and blue look to it, while sunset has more of a red and orange look. Is that really what they look like, or is it because of some personal bias, such as comparing sunrise to the darkness just before it and sunset to the bright blue sky?
They really look different. The geography and atmospheric conditions that affect how the sun and sky looks, including pollution, differ from East to West of wherever you are and also from morning to evening.