I would recommend NBS accountancy only for 2 things: time and curriculum.
The fact that NBS is the only school that offers 3 year honours degrees and graduates over 1,300 (business + accounting) students every single year speaks a lot. And they have been doing so for over 50 years.
The curriculum at NBS is very rigourous. Many of my friends have been to SMU on a local exchange programme and they agreed that SMU courses are easier. SMU accounting courses do not have bell curve - they are simply moderated. NBS on the other hand has a bell curve, and the median score before applying bell curve can be a D+ for some papers, just to illustrate how crazy hard the papers are.
That being said, NBS does produce many obedient workers who tend to follow the conventional path of audit in the Big 4. With a cohort of 650 students every year (more than NUS + SMU combined), of which over 60% head to the Big 4, it is no wonder that starting salaries are low compared to the other universities whose graduates typically go to banks.
In my opinion, SMU has emerged in recent years as a really innovative school that is able to brand themselves well. There is no doubt that some employers favour SMU grads over NUS and NTU. But also bear in mind that NUS and NTU have a far larger alumni base (and it will only continue to grow since NTU admits twice the number of students in NUS and SMU each year), so I do not feel that either school has a real advantage.
Hence, accountancy wise, I would rank NTU > SMU > NUS
But for business, it would be SMU > NUS > NTU.
TLDR; was offered NUS NTU SMU accountancy and business, chose NTU, recommends NTU, but thinks SMU is pretty good too.