I think that the Roman Empire was advanced than the Greek and Byzantine empires. Most people who would hear this question would think that the Byzantines where more successful because they had both Roman and Greek influence. But I think the Roman empire was the most advanced because they managed to extend their empire further than the Byzantines and we able to maintain it until the empire fell. The Byzantines couldn't manage this because after Justinian the Great's death, they were not able to keep their newly conquered empire under control.
