What are the best places in Equatorial Guinea to obtain the most favorable currency exchange rates for XAF (Central African CFA Franc), USD, EUR, and other major foreign currencies while minimizing fees and ensuring secure transactions? Which banks, licensed exchange bureaus, airport currency exchange counters, and financial institutions in cities such as Malabo and Bata are considered the top choices based on exchange rate competitiveness, convenience, reliability, customer trust, and accessibility for travelers, expatriates, and business professionals?