I did my undergrad at NUS, and Masters at SIM.
As an employer, I find that grads from SIM-UOL are as good as those from NUS/NTU/SMU. The question has to do with job fit.

Where I am in fund management, some roles just suit local unis better because they have education that helps in those roles. Like Quant, Market Risk etc.
But most other roles that do not need specialised knowledge are fair game, and what really matters is that you leave a good impression and form a good connection with the hiring manager.