Hi, Both have their prospects. you can judge the one you are interested in by knowing what they actually deal in.
Pharmacy- You can work with pharmaceutical industry in research, development, formulation, production and marketing of new kinds of drugs for clinical use.
Biotech- the demand for biotechnologists is high and one deals with research and development, quality control, clinical research, manufacturing and production,information systems etc.
Anyone you join, the good institutes like NITs, IITs, will offer you good placement opportunities. Good Luck.