Marduk and Tiamat were fighting over whether the nature of creation would be defined by order or chaos. Teshub and Illuyak (like Typhon and Zeus) were fighting over which would be allowed to rule the world. In many ways this makes the Babylonian gods appear more powerful than their Hittite and Greek successors. The Babylonian ones fight over forming the very nature of creation. The Hittite gods fight over control of a world created outside of their authority, and a world that contains them and their power, great though it may be.
