Sun Yat-sen University, a key university under the National 2 1 1 Project and the 985 Project, has a history of one hundred years. If I remember correctly, the recent university ranking is the seventh in the country, and CUHK's finance (Lingnan College) and medicine are second to none. In fact, there is a lot of information if you look it up online. Needless to say, there is too much here.
It depends on what major you want to study. Overall, CUHK is quite good.