Sunbrella comes in a multitude of colors from white to black. Unfortunately some hold up better than others here in the Houston area. Whether it's the heat, humidity, or chemicals in the area, some colors that work in other areas seem to degrade rather quickly here. As time goes by I'll add more photos of materials that don't hold their color.
This is a sail cover that I made about 10 years ago. The customer wanted a rainbow on his sail. As you can see the darker colors, the green and blue have held up better than the yellow, orange and reds. Darker colors in general hold up well in the sun. Plus the darker colors transmit less UVs through them. Nice to know if you're putting a bimini on your boat.