Which account of “al-ṭālibu mujtahidun” versus “yajtahidu al-ṭālibu” is well qualified?

Supplementary Practice 5: Textual Analysis, Scope of Meaning and Rhetorical Judgment

• The nominal clause proves eternal permanence in all cases
• A verbal clause can never imply habitual effort
• The nominal tends toward stability and the verbal toward occurrence/renewal, without an absolute rule
• There is no grammatical or rhetorical difference