This study is to illustrate the difference between Islamic and traditional banks in relation to consumer decision-making. Data is taken from both banking sectors for evaluation. The difference in the term factors affecting customers and banks and the quality of service provided to the customer is examined, so this study seeks to assess the performance situation and improve the quality of service in the Islamic financial system. We are looking at this issue through a variety of methods such as the creation of a quantitative portfolio, the economic modeling of diversification advantages, the theoretical development of the quality of financial service and the qualitative analysis of semi-structured interviews on perceptions of how quality of banking will affect both performance and financial innovation in Islamic finance. Iraq is experiencing a high level of competition between Islamic and traditional banking services that use quality of service as a profitable strategy The aim of this study is to describe and understand the decision-making process for clients in terms of recognizing differences in the quality of services between Islamic and traditional banks and the extent to which customers are affected by banking services.