وَحَقِيقَةُ التَّفْضِيلِ: أَنَّ قِرَاءَتَهُ أَفْضَلُ، لِمَا أَنَّهُ أَنْفَعُ
The intended excellence is that reciting it is better because it is more beneficial.
Benefit need not be restricted to acquiring more information. Recitation may reinforce faith, improve character, guide conduct and provide remembrance.
A surah may be particularly beneficial for one instructional or devotional purpose, while another may suit a different purpose. Comparative excellence here concerns the benefit of recitation, not a hierarchy within the divine attribute itself.