«اِلْحَسَنْ خَيِّ الْحُسِينْ»

The saying points to al-Hasan and al-Husayn, the brothers revered as grandsons of the Prophet Muhammad and honored especially in Shi'i tradition, to claim that the two things or people being compared stand on the same footing. Whatever can be said of one applies just as well to the other.

In practice it settles a comparison by declaring the two equal: neither has a real advantage, and no ranking is implied. The image of brotherhood suggests a natural, inborn likeness, so the match is presented as deep and genuine rather than a coincidence.

Say it when two people or things turn out to be essentially equal, so ranking one above the other makes little sense. It suits informal talk as a brief closing remark on a comparison; because the names carry deep religious reverence, use it respectfully.