White face works best in low light. It is not the color of the lettering but the color of the needle that you will notice.
In practice it is not so much that you can tell the needle for whatever is exactly 1/3 of the way between 3 and 4 in normal situations, it catches your eye because it is in between 6 and 7 instead of between 3 and 4.
However, you can just do a google
image search for "analog dash gauges" and you can compare all the pictures against each other and decide for yourself. What works best for me might not work best for you.