1) ISIS prefers Turkey over Saudi Arabia as an ally because Turkey provides an outlet for ISIS to export oil through Turkish ports. Saudi Arabia is a competitor in oil exports and has poor relations with ISIS. 2) Turkey also borders the regions of Syria and Iraq controlled by ISIS and Sunni Islamist groups, making Turkey strategically important for logistical and military support. 3) Saudi Arabia faces more barriers to allying with ISIS such as opposition to ISIS's goals and a history of poor relations with Saddam Hussein and Sunni groups in Iraq.