Who is greater, Zheng He or Columbus?

Zheng He's voyage to the West was mainly to publicize the national prestige and collect exotic treasures for the emperor. Although he achieved this goal, for the Ming dynasty, he consumed a lot of manpower and material resources but gained a little prestige on his face. I don't think it is worth it. But as far as Zheng He is concerned, it is indeed a great feat to lead Europe for one hundred years in seven voyages to the West. Unfortunately, the vision is too narrow. Of course, this can't be blamed on him, which was determined by the national conditions at that time. For example, Columbus opened up a new sea route, ushered in the era of great geographical discovery, and played a huge role in promoting the modernization of the world. He really contributed to the increasingly integrated world. However, we should treat it dialectically. The opening of the new sea route also caused Europeans to carry out crazy colonial plunder and evil slave trade, which brought profound disasters to the people of Africa and America. Columbus himself worshipped gold very much. There is no doubt that Columbus's contribution to world history is very great, and Zheng He only preached the so-called Daming national prestige. I think Columbus is greater. ]