The most beneficial thing on the Day of Resurrection will be a courteous behaviour which will outweigh all good actions. But that will be witnessed in case of a believer as there is no question of weighing a non-believer's good actions. Allah Himself says in the Qur'an: "So their works are in vain, and on the Day of Resurrection, We shall assign no weight for them." So will a morally depraved and nonsensical man stand unfavoured with Allah, and this will be a sign of his frustration and disillusionment in the Hereafter.