What was the biggest difference between government in acienent athens and the ancient rome

The biggest difference was that Athens was a democracy and Rome was an oligarchy with some democratic elements.
Democracy was invented in Athens in the late 6th century BC. To the Greek this meant power to the people and they meant it literally. All the decisions were made by male citizens gathered in the assembly of the people, which also voted on bills. The executive implemented the will of the people

Separates powers, keeping one body from gaining too much power. In what way did ancient Athens influence the framers of the United States Constitution? What was the biggest difference between the government in ancient Athens and in ancient Rome? Athens allowed all citizens to vote, while Rome was a republic.