What if Civilization hadn't developed some 2,000 years later in China than it did in the West?

One of the points fairly well accepted by most historians about early civilization, but not much discussed, is the fact that civilization actually developed in Sumeria and Egypt about 3600 B.C., but did not fully flourish in China until about 2,000 years later, under the Shang Dynasty, around 1600 B.C.. Now the reasons for this are almost certainly geographical. China is rather isolated from the rest of the world, and probably more importantly, there simply weren't any locations in China comparable to the Nile Valley or the region between the Tigris and Euphrates rivers in terms of their suitability for the intense early agricultural cultivation necessary to sustain civilization, with minimal technology or social organization. The river valleys in China are simply more difficult to manage in terms of irrigation, flooding etc. than were those of the early centers of civilization in Egypt and Sumeria. So, it took a very long time for people to adapt and develop the means necessary to exploit them in China. What have been the consequences of this, exactly? Almost everyone would agree that civilization in China is rather different from the West. But, is civilization in China in advance of the West, or, is civilization in China behind the West? Or, is it both, in particular ways? So, in China, civilization developed later, but, special skills were necessary to sustain it which probably were not necessary in the West. So, let's suppose that China did, indeed, have something like a Nile Valley or the fertile plain between the Tigris and Euphrates rivers. How would history be different, both for China, and for the world as a whole?