Every Shonen manga has a tournament thanks to Dragon Ball. Its a clever way to introduce new characters that can become rivals, friends, and nemesis to overcome. The difference is that Toriyama is an expert at drawing fights and pace. Imho, Kishimoto's Chunnin exam was a lot better by doing exactly what Oda should have done with different contests, teamwork, actual fights, more likable newcomers, and constantly changing the locations.