Which is stronger, ancient Rome or Tang Dynasty?

In the Tang Dynasty, the Roman Empire was the Eastern Roman Empire in the Tang Dynasty, but the Byzantine Empire was not as powerful as the Western Roman Empire at that time. After the Roman Empire was divided into the Eastern Roman Empire and the Western Roman Empire, the Western Roman Empire was still strong, but in the Byzantine period, the Eastern Roman Empire was so strong, but it was not as strong as the Western Roman Empire. In the heyday of the Tang Dynasty, there was no problem against the Byzantine Empire from 620 to 833, but by 875, the fighting capacity of the Tang Dynasty had turned from prosperity to decline. Fighting the western Roman empire is bound to be a fiasco. When fighting against the Byzantine Eastern Roman Empire, it can also hold back the main force of the Byzantine Empire, just as Yue Fei destroyed the State of Jin, but it can't destroy the Eastern Roman Empire in its heyday, and it can also be defeated by attacking the Western Roman Empire, but the time difference is 7~ 15 times that of fighting against the Byzantine Empire. Although it cannot be defeated, it can contain 2 1%~62% of the main force of the ancient Roman empire.