If Nazuna's hints are to be trusted, then BB should have the best cards on this race.
Just some things we don't know:
1) Did they randomize the results again, like they did previous time with the swanboat races?
2) Are Nazuna's hints a direct translation of the original texts (so they wouldn't be an indication if the results were changed), or are they conceived by the translators/Nutaku-developers as actual hints, or are they conceived by the translators/Nutaku-developers as either red herrings or flavortext?