Going back to your question on which concentration would be best, I think if your background is in Law, then Finance would not be a good choice. The field is very technical and if you want to be good at it you would need a strong mathematical background. In fact, of all the business fields, finance is probably the most technical one, and most people specializing in finance are economists or even mathematists or physicists. Almost every other field of concentration should be fine though.
In terms of career prospects, I don't know if any general advice can be given. It pretty much depends on what your interests are. Anyways take into account that any MBA will give you general training in the different business functions (general management, marketing, finance, operations), so the fact that you choose one concentration or the other will not close you any doors in the job market. For your career the really important thing will be to do a good MBA and be sure about why you are doing it and what type of job you'd like to get afterwards. Employers sometimes complain that MBA graduates come up with their degree and don't really know what they want to do with their (professional) lives.
Going back to your question on which concentration would be best, I think if your background is in Law, then Finance would not be a good choice. The field is very technical and if you want to be good at it you would need a strong mathematical background. In fact, of all the business fields, finance is probably the most technical one, and most people specializing in finance are economists or even mathematists or physicists. Almost every other field of concentration should be fine though.
In terms of career prospects, I don't know if any general advice can be given. It pretty much depends on what your interests are. Anyways take into account that any MBA will give you general training in the different business functions (general management, marketing, finance, operations), so the fact that you choose one concentration or the other will not close you any doors in the job market. For your career the really important thing will be to do a good MBA and be sure about why you are doing it and what type of job you'd like to get afterwards. Employers sometimes complain that MBA graduates come up with their degree and don't really know what they want to do with their (professional) lives.