What does it mean to rather let the green dragon be ten thousand feet taller than to let the white tiger be one foot taller?

It is better to call the green dragon ten thousand feet tall than to let the white tiger be one foot taller. The meaning is

"Green dragon and white tiger are not only directions, but also refer to men and women.:" Generally speaking , the green dragon should be meandering and supple, while the white tiger should be low and slow, even more supple than the green dragon. Echoing the green dragon, hugging the left and right to enhance the vitality of the acupuncture point, this is in line with the standard of good Feng Shui in the eyes of Feng Shui experts... …”

Generally used to describe Feng Shui.