It depends on you. What matters is whether you want to pursue a career for a good job or a research oriented career. If you want to study in order to get a good technical job after your masters, the answer is M.Tech. If, on the other hand, you want to pursue higher studies like you want to earn a PhD, then you may go for an MS in India or abroad. For MS abroad you have to appear in GRE and TOEFL and score the requisite marks.
The above routes through M.Tech and MS may also help you in the reverse way, that is MS for a job and M.Tech for research but what is stated above is generally true.
For an M.Tech you will undergo more class room study and less project work. For an MS it's just the reverse.
So you can understand that the choice entirely depends on your outlook.