SMU grooms students to work in banks. Even if you are average, you still get a good chance. On the other hand, NUS / NTU engineering courses groom their students to be engineers and only a handful of the creme de la creme get into banking.

The people whom you mix with also matter. In SMU, you get to meet more like-minded people and you can definitely learn from one another.

If you can afford it and are capable enough, do an MBA in the world's best MBA schools after you graduate locally, maybe after accumulating 1-2 years of work experience.