هِنْدٌ أَفْضَلُ مِنْ خَالِدٍ. / هِنْدٌ الْفُضْلَىٰ.
With min, afḍal remains masculine singular; with al, al-fuḍlā agrees with the feminine subject.
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The Feminine: Compare the Rules
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
هِنْدٌ أَفْضَلُ مِنْ خَالِدٍ. / هِنْدٌ الْفُضْلَىٰ.
With min, afḍal remains masculine singular; with al, al-fuḍlā agrees with the feminine subject.