From the Diamond website...
Why choose the Simonis Tournament Blue color?
The most favored consumer color preference universally is blue.
As a shade of the sky, the sea, and one of the colors of the flag, blue symbolizes security.
Blue steadies the emotions.
Higher energies such as communication and creativity are enhanced under blue light.
Word associations with blue: calm, tranquil, constancy, patience, and perseverance.
Personality descriptors relating to blue: dignified, poised, rational, relaxed, and balanced.
The most commonly used color of chalk is blue; therefore, chalk doesn't mark this cloth
as much.
Tournament Blue Simonis 860 is designed for MAXIMUM contrast; making it easier to
see the balls.
Tournament Blue Simonis 860 is designed for MINIMUM eye-fatigue; allowing you to
play longer.
Tournament Blue Simonis 860 is designed to be the best color under bright filming lights
of televised tournaments.
Tournament Blue Simonis 860 is now available. Let your league operator, bar owner and favorite poolhall owner know.
I like the Blue because it is brighter and easier to see the balls, (not because higher energies such as communication and creativity are enhanced under blue light)
I have it on my home table and I install more of it by far than any other color, especially among actual pool players.