Using a multi-attribute decision analysis and twelve criteria, a Fuzzy Decision Analysis has been developed on computer to compare traditional banking with Islamic banking: The comparison has been made for three scenarios: a secular society at the present time, a Muslim society at the present time and a Muslim society ten yearshence; For all scenarios, it is found that Islamic banks are preferred to traditional banks. Uses diagrams and tables. Based on primary and secondary sources. Documented. For economists and bankers.