NTU is ranked higher than Southampton. However, more importantly, look at where you want to work later on. With NTU, you have the network and assistance in finding a job in Singapore after you graduate. Earning SG$ compared to MY$. Pre and hopefully post COVID19 pandemic, many professionals work with international firms which allows for overseas work and training. In Malaysia, you may not have those benefits for your career after you graduate from Southampton. In fact, if you wanted to work in Singapore, most employers tend to pick NUS/NTU/SMU graduates over that of overseas universities.

https://www.channelnewsasia.com/news/singap...nities-13124590 You only have to look at this video produced by Channel News Asia (Singapore) which shows that even Singaporeans themselves who graduate from overseas universities or private universities in Singapore, are more disadvantaged in the Singapore job market compared to local public universities graduates.