I think Bonanno leaned toward the "conservative faction" while Luciano was part of the newer "liberal faction" of bosses (Tony Accardo, Costello, Anastasia etc.) The liberal faction bosses didn't care much for Sicilian tradition while the conservative faction bosses emphasized old world tradition, honor, rituals and perhaps a sicilian only attitude. These descriptions were probably made up by historians, but I think it describes real contention in the mob at the time. In interview (60 minutes?) Bonanno Sr describes Luciano as being only interested in making money.