We compare, using data envelopment analysis (DEA) and meta-frontier analysis (MFA), the performance of Islamic and conventional banks during the period [2004][2005][2006][2007][2008][2009]. The use of nonparametric MFA is new to the Islamic banking context. Our DEA finds no significant difference in mean efficiency between conventional and Islamic banks when efficiency is measured relative to a common frontier. The MFA however, reveals some fundamental differences between the two bank types. In particular, the modus operandi in Islamic banking appears to be less efficient on average than the conventional one. Managers of Islamic banks, however, make up for this as mean efficiency in Islamic banks is higher than in conventional banks when efficiency is measured relative to their own bank type frontier. A second-stage analysis shows that differences between the two banking systems remain even after banking environment and bank-level characteristics have been taken into account. These findings are relevant to both policy-makers and regulators. In particular, Islamic banks should explore the benefits of moving to a more standardized system of banking, while the underperformance of conventional bank managers could be examined in the context of the on-going remuneration culture.