I work in industry and am also attending a major U.S. university to get another master's degree, this one in Applied Math.
When I entered the program, the department offered a Master of Arts (M.A.) degree for Applied Math. This year, the department made a change to Master of Science (M.S.); any new students coming in Fall 2014 will be M.S. students, and any current students will be given the option of switching their degree from M.A. to M.S.
Should I make the switch from M.A. to M.S.? I already have a M.S. degree in engineering. In my opinion, all other things equal, M.S. is considered more rigorous from an employer's perspective.