As stated above, it would have to be clones to be considered a true race. Seeds have way to many variables.
I just don't think you could call it a real competition. Lets say you give seeds out, right? Then one guy has a pheno that finishes in 63 days and another has one that finishes in 77.
Now lets say the first pheno produces a massive bush, super potent and frosty and the second doesn't. Is that grower error? I believe there's only so far you can go with your environment, once it's perfect and you have your schedule you have to rely more on genetics.