The Romans prided themselves on conquering and ruling. Then, wanting to tie all the conquests together. All roads lead to Rome. You know what they say about the Roman roads. Very well made. So they were doers. They appropriated things as their own. Even the Roman gods were "borrowed" from the Greeks via the Iliad.
The Greeks, on the other hand, made many discoveries and were as a result well versed in mathematics, geometry, astronomy. The Romans used all those discoveries. Used them. Doers. The Romans built aqueducts, dams, roads, bridges, architecture. Much of this doer mentality of the Romans was facilitated by the discoveries of the Greeks.
The Romans were realists, the Greeks, dreamers. A Roman statue of a leader has a big nose, the Greek version would be idealized view of that leader. And a pretty nose.