As others have said before me Rome had a much larger impact on the world at large as in its later stages it endorsed Christianity boosting to a status of a major world religion. Another major influence was the effects of Latin on the formerly Germanic languages of Areas such as France and England. Also Rome gets some credit for surviving in some for a lot longer (1480 Years for the Roman Empire (Including East Rome and Byzantium of course) compared to 426 Years for the Han Dynasty).