The statement that best describes Cincinnatus and Julius Caesar is:
Cincinnatus accepted the role of dictator in a crisis and then gave up his power; Caesar used a crisis to gain power and then made himself dictator for life.
This accurately reflects the historical actions of both figures: Cincinnatus was known for taking on the role of dictator in a time of emergency and willingly relinquishing that power once the crisis was resolved, while Julius Caesar took advantage of crises to consolidate power and ultimately declared himself dictator perpetuo (dictator for life).