I often use my silver chocobo as a sentinel so decided to level up a new chocobo (went with white, since KD has already proved it reaches 800/800 limit) designed for racing. It doesn't make money as well as the silver one does since it doesn't have dark horse,
but when it comes to winning races, it always wins by a mile, even on fal'Cie - which I can't say for my Silver Chocobo since it has a few sentinel abilities that I don't want to pass up for racing abilities. My White Chocobo has nine racing abilities, and it's awesome. I need to write up a guide for making a moneymaking Silver Chocobo and a racewinning White Chocobo sometime.