The most accurate comparison of the government systems of Sparta and Carthage among the provided statements is:
The Spartan and Carthaginian governments both had two leaders. The Spartan government had hereditary kings while the Carthaginian government had elected leaders.
This statement succinctly highlights the difference in the leadership structure of both governments, emphasizing the hereditary nature of Spartan kingship compared to the elected leaders (suffetes) in Carthage.
The other statements contain inaccuracies or misrepresentations of the facts regarding assemblies, councils, or the focus of the governments.