Microbiology

Vinit, Microbiology is the study of microorganisms, which are unicellular or cell-cluster microscopic organisms. In short; microbiology refers to the study of life and organisms that are too small to be seen with the naked eye. It is a broad term which includes virology, mycology, parasitology, bacteriology and other branches.
Biotechnology is technology based on biology, especially when used in agriculture, food Science, and medicine. It combines disciplines like genetics, molecular biology, biochemistry, embryology and cell biology, which are in turn linked to practical disciplines like chemical engineering, information technology, and biorobotics. Patho-biotechnology describes the exploitation of pathogens or pathogen derived compounds for beneficial effect.
If you are interested in research work than Microbiology will be the best for you. Otherwise both the branches are equally good.
Now institution plays an import role. There are many good universities that are offering these courses along with good placements.
Check some websites for more details.
Good luck.