What is the difference between ancient Greek ships and sea vessels of our time?

What is the difference between ancient Greek ships and sea vessels of our time? (What materials were these ships built from? How do they differ in size? In speed?)

Greek ships were built from wood. They could reach speeds of up to 7-8 knots, and their length was 30-40 meters. On the other hand, ships of our time are built of metal, they are much larger in size. The largest ships can have a length of 200-300 meters, and their displacement is measured in tens of thousands of tons.