MS stands for Master in Science and MBA stands for Master in Business Administration.
Both MS & MBA are equivalent courses.
Both MS or MBA courses are better, its depend upon your interest.
If you are interested in Business field then you can do MBA or If you are interested in science field then you can do MS.
And after MS or MBA courses, you can get a better JOB and handsome salary.
According to my opinion you can do MS after B.Tech. in Biotechnology.