Whether to go for MBA/MSC?

I have recd offer for MBA/*MSC programme.I am not able to decide which is right.Basically I have been in the investment advisory field for around 6 years.I am not very much interested to work in the corporate field.I am more pionate about teaching want to pursue CFA and have my coaching institute.But going by the general perception that only freshers go for MSC & experienced candidates go for MBA.