Consider two statements that may initially appear to conflict:
1. The Qur'an is one divine speech. This concerns the unity of the attribute.
2. Reciting certain surahs may have special merit. This concerns reward, benefit or the frequency of mention of God.
They are not contradictory, because they involve different respects. A genuine contradiction requires affirmation and denial of the same thing in the same respect, meaning and context.
Keeping the respects distinct safeguards belief in the unity of speech without dismissing reports about the merits of particular surahs.