Hard to answer this question. It depends on your preferences, personality, and many other factors.

First of all, you need to consider the factors: the income you can get in hand and the cost of living in that city;

Second, the urban environment of the city where you want to live;

If you want me to recommend the best Chinese city to visit and live in, I would recommend Chengdu or Hangzhou as your choice. Why?

Chengdu is a good place to visit, with gorgeous outdoor scenery and delicious food. Native home of the giant pandas. The beautiful Jiuzhaigou Valley is also very close. In addition, Chengdu has a low living cost and good weather.

Hangzhou is nice and modern. The West Lake is arguably the most famous sight in Hangzhou and it is beautiful to see. Generally lower cost of living compared to Beijing, Shanghai, Shenzhen and Hong Kong.

If you want to have your business, Beijing, Shanghai, Shenzhen and Hong Kong would be a good choice. There are more job opportunities and high salaries, simultaneously with very high living costs.

Of course, there is no absolute answer to this question. It's up to you to figure out what kind of city is best for you.