In fact, Sun Yat-sen University is still very strong in management, economy and finance, and the employment of undergraduates in the School of Management and Lingnan College of Finance and Economics is particularly prominent. There is no doubt that HKUST is a science school, and there is no denying that it is academically superior. However, due to regional differences and differences in the nature of schools, CUHK and HKUST cannot be confused. I suggest you ask more in-depth and targeted questions, such as comparing the mathematics between HKUST and CUHK, and the physics between HKUST and CUHK. Then I can safely say that HKUST is really better. However, it is biased to kill with a stick.
In addition, because CUHK is located in Guangzhou, employment has a little geographical advantage.
By the way, I studied mathematics in CUHK, and I think this evaluation is still very pertinent.