"And who is better in speech?"—the verse. This is in the form of an interrogation, meaning: there is no one whose speech is better than his.
﴿وَمن أحسن قولا﴾ الْآيَة , وَهَذَا على الِاسْتِفْهَام؛ أَي: لَا أحد أحسن قولا مِنْهُ