Coffee and Zahava’s Dad, there are two general (each country has its own dialect) types of Arabic: street Arabic and literary Arabic, which is spoken by the elites and is almost unintelligible to the mases (a professor of Arabic went to the Arab market after the Six-Day War and tried to speak to one of the vendors. He said “I don’t speak English”).
As for the Hebrew of the Eidot HaMizrach, most experts on the subject, as welll as Rav Kook, hold that the Yemenite pronunciation is closest to the original.It is certain from various soureces that thte tzaddi, for example, was actually a hard “s” as some of them pronounce it.