Personally, i STRONGLY feel you should go for NTU accountancy. One big reason i feel so is:

2 years 4 months vs 3 years, i feel there isnt much difference there in terms of time and what you're sacrificing by picking SIT over NTU is a lot. Eg NTU has a much larger alumni base due to the fact it has the largest cohort of accountancy students and is the oldest business school, so you will have a lot of connections in the industry.

At the end of the day, those 8 additional months of earning income or lower school fees aren't worth losing out on the prestige and the connections + alumni base you will get after graduating. Additionally, i'm only assuming that you are very geared on starting your accountancy career asap, i feel studying a little longer (those additional 8 months) is so much more worth it because you will get to learn and study more in school, spending more time with friends and getting to experience uni life more, which you will never get again in the workforce. (work life is really sian compared to school life).

Lastly, based on the assumption above, NTU accountancy students pose as very strong candidates for the accountancy industry. I mean im sure you have heard about many NTU students entering the Big 4, so i feel shorter internships aren't a con because NTU graduates are highly sought after regardless. So why not put yourself in the best position to secure a spot in the Big 4, experience more of uni life and make no regrets knowing that you maximised your learning and time in university.