You know it's an extra 60 credits to pass a postgrad masters course over an undergrad one? A significant number of my undergrad friends did the undergrad as it was another year to delay getting into the "real world"*, those that do postgrad masters make a conscious decision to go back and further themselves (for whatever reason).
It's probably another industry specific thing though so general statements of this and that probably don't work. For example those that did the undergrad masters have had to fight it out with the other BSc grads, whereas those that did MSc's managed to bypass that scrap and went throught the doors opened for them higher up. It did magically open doors for us. On the other hand the undergrad masters is the ideal stepping stone if you want to do a PhD.
An MSc isn't there so you can stall a year in the real world. You need to consider what you want to do and then apply for the right course**. The right will further your career and give you that stepping stone you need to get to the next rung (or any job in the industry you want). It's not to be taken lightly IMO, if you do then it's probably not going to help you, other than get you in more debt.
*coincidentally significantly easier than my MSc and much better paid.

** both the course content/type and the connections to the industry you want to get in to. If it has lots of courses taught by guest lecturers then it's it'll probably get you a job a lot easier than a totally academic one.