Consider the abundance of legality and practicalities we find in Roman politics, starting with the legal concept of provincia, developed after the annexion of Sicily, and the radical absence of constitutionality and/or legality which we always find in Greek politics.
The exercise of political responsibilities and charges in Rome is a much more settled down, theorized and organized process than in Greece, especially in Archaic and Hellenistic Greece where the only office is raw power and personal charisma.