Well, for master's prepared nurses, they basically did more academic work than BSN nurses. That can be an edge to employers. Also, a lot of MSN grads go on to DNP programs, which will take them less time compared to BSN grads.
For NP programs, there's a national policy saying that all MSN prepared NP needs to now become a Doctor's prepared NP by 2020 or starting 2020. So MSN level NP is not up to the new standard anymore. So if you want to become an NP, DNP programs are highly recommended for pursuing your long term career as an NP. Otherwise, you will have to go back to school to transition to a DNP at a later time which is more work.