Green is the most common, there are black, red, blue, yellow
Color and quality are irrelevant, just a kind of personalized performance.
The PCB board mainly considers the material and thickness, and rarely considers the color. What you are talking about is the color of the solder resist ink. The solder resist ink has white, yellow, black, red and blue colors. There is also a transparent ink. The most used is the green ink. There are differences in solder resist inks used according to the accuracy requirements of the board. . .