أَتَخْشَوْنَهُمْ فَاللَّهُ أَحَقُّ أَنْ تَخْشَوْهُ
Do you fear them? Allah has more right to be feared. (al-Tawbah 9:13)
The question conveys prohibition: do not fear them in this manner; fear of Allah takes precedence. It is not a neutral survey of the addressees' feelings.
هَلْ أَدُلُّكُمْ عَلَى تِجَارَةٍ تُنْجِيكُمْ مِنْ عَذَابٍ أَلِيمٍ
Shall I direct you to a trade that will save you from painful punishment? (al-Ṣaff 61:10)
This question creates anticipation and eagerness (tashwīq) for valuable information to follow.
The first discourages an undesirable response; the second awakens interest in an important teaching.