Green and gray resin tiles are more popular colors. Some people say that gray is more atmospheric, some say that gray is more resistant to aging. Some people say that gray has a more antique effect.
As for green, it is indeed less in quantity than gray. Some people say that using green is like wearing a green hat, and some say that green is closer to the color of plants.
In fact, gray and green are the most commonly used colors in antique tiles. They are complementary colors to yellow. Due to the obvious hierarchy in feudal society, yellow is generally used by emperors. Green is generally used by kings and generals. And gray is generally used by civilians. We can see this in some ancient buildings.
From a visual point of view, gray is indeed more atmospheric. And green looks more expensive.