It might be worth considering what you did in your primary degree as I would be inclined to do something in a non cognate area. For example, if you did a BComm, you might be better off with something other than the MBA. If you did something cognate to neither, you probably want to ask yourself if you see yourself qstaying in the security business long-term; in which case, the security related masters may be the one to choose, assuming there is some management/accounting/finance.