Which environmental major is better, Nanjing University or Xiamen University? What is the difference between environmental science and environmental engineering? Which has a better prospect, marine science or environment? Nanjing University's is better. Environmental science is a theoretical science, while environmental engineering is a practical science. Generally speaking, environmental engineering is better if you want to learn the environment. As for marine science, the scope is relatively wide, the marine environment is a bit limited, and the science and technology about the ocean is not very developed. Which is good for your hobby?