In horse racing whats better a horse gelded a colt or a filly ?

I'm afraid I don't really understand the question, and I get the feeling that you don't really understand what you're asking. A gelding is a male horse that has been gelded (similar to the way dogs/cats are neutered) so that he cannot produce offspring. A colt is a baby/young male horse, and a filly is a baby/young female horse. I'm not sure if that information helps you at all, but without further information on what you're asking, it's the best I can do.