Well I can give some info on this...
Friend has a yellow choco 1st generation with maxed Str/End and it doesn't run as fast, just about equal, to a stables/npc choco.
Also the color of a parent isn't inherited no matter what date plan you choose. My 3rd generation choco had a black female and blue male as parents but ended up yellow. The choco did inherit one of the mother's abilities but thats about it. It depends more on how you take care of it and what you feed it.