Usually most students prefer M.Tech. to M.S. in the same University. Reason is mainly the fixed duration of M.Tech. compared to not so fixed duration for M.S.
In short, if you are not sure prefer M.Tech. If you are really into a research area prefer M.S. Opportunity wise not much difference. I would always prefer an M.S. from an IIT/IISc compared to M.Tech. in top NITs even if its risking 1 extra year. Many people do the other way.
Usually most students prefer M.Tech. to M.S. in the same University. Reason is mainly the fixed duration of M.Tech. compared to not so fixed duration for M.S.
In short, if you are not sure prefer M.Tech. If you are really into a research area prefer M.S. Opportunity wise not much difference. I would always prefer an M.S. from an IIT/IISc compared to M.Tech. in top NITs even if its risking 1 extra year. Many people do the other way.