لَا رَجُلٌ أَفْضَلَ مِنْكَ — lā resembling laysa: rajulun nominative ism; afḍala accusative khabar.
لَا رَجُلَ قَائِمٌ — generic-negating lā: rajula built on fatḥ in the accusative position; qāʾimun nominative khabar.
Both express negation, but their governing action and case marking differ.
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Ism of Mā and Lā Resembling Laysa; Khabar of Lā of Generic Negation
لَا رَجُلٌ أَفْضَلَ مِنْكَ — lā resembling laysa: rajulun nominative ism; afḍala accusative khabar.
لَا رَجُلَ قَائِمٌ — generic-negating lā: rajula built on fatḥ in the accusative position; qāʾimun nominative khabar.
Both express negation, but their governing action and case marking differ.