Red or grey coloured colour..which is best for me

So sorry! This is not Feng Shui. But based on facts.
In the past, when cars do not have a third brake lights and the brake light lamps are not very bright.. there were higher incidences of red cars having more accidents.
In the past or today, what ever the period; Insurance companies in the west seems to want to charge more if a car is grey in color... I wonder why?