Public leaderboard ranks individual competitors and their best score. Public leaderboard is open while competition is open, a user can send as many models as they want.
Private leaderboard ranks individual competitors and a unique final score is sent at the end of the competition during a short period of time. Private leaderboard ranks just the competitors who sent a final model following our rules and are the ones eligible for the prize. For this reason you see less competitors than public leaderboards.