How did the Greek and Roman versions of democracy differ?

Greek, particularly Athenian, Democracy was a participatory democracy. The number of people who were allowed citizenship was comparatively small; so each citizen was expected to attend public meetings such as the Assembly, which was the city council meeting. The juries numbered 500 instead of the twelve of the English jury system. Every property owning male of eligible age, both of whose parents were born in Athens had a civic responsibility to participate. Rome was a republic. Each class, aristocrats, equestrians, and plebeians, elected representatives for selected offices. The aristocrats sat in the senate, which was the deliberative body, made most of the decisions, but some decisions were subject to plebiscite, the approval of the lower classes, similar to a California referendum, today.