Hello Shivagi,

It completely depends on your interest. Considering you want to pursue your career in India, the demand for M.BA is more than M.Tech/M.S students in Metallurgy, but in case you plan to go outside India, there is no biasing, and there is an equal demand for Mettalurgy people as well. You may consider doing research, in foreign, and then apply to a university and become a professor, or you may get admitted to some good company dealing with pharmacy, or civil. 

For M.BA, you should complete it from a well-reputed college in order to get successfully placed, as you can see the scenario that now everybody is holding an M.BA degree, hence the market is getting stagnated, and therefore the students who possess a degree from a reputed institute are more preferred. You may join any company as the post of Market Analyst, HR, Operation Manager, Consumer Reviewer, after completing the M.BA.

Hope this Helps

Regards