hi,

see ms courses in iits or iiits are researched base and if you have zest to learn new things and want to work as a researcher them I recommend you to go for ms course. the course duration is flexble, 2-3 years and depends on the completion of thesis. ms course syllabus is different from mtech and students who want to do phd or more higher studies or want to do career in education sector should go for ms course. but if job is your main priority you should go for m.tech since mncs are more interested to hire mtech students rather than MS.