From your decision making process, you will not be able to make it in SMU. You dun even know about business specializations such as Finance, Marketing, HR, Operations, etc... All the information is widely available and you still listen to stupid advice like general vs specialized when you can already pick and choose how broad or specialized you want to be.

The obvious solution is to take Econs and a second major in a business specialization.

But given the simplicity of your questions and though process, i recommend you to take NTU biz. Just finish 3 yrs and quickly get a job.