This is depends on you . In which you have more interest , both are equally good . Mtech means it's belongs to technology and Ms mens it's belongs to more  theoretical science .

There are many chance to go abroad and also similar in India . It's also depends on you. This itself will answer if you should study in India or try your fortune abroad. And also you have to choose your preference colleges .

Like in India IISc/IITs/NITs/IIITs/ BITS Pilani/ State University Colleges of high repute (like UVCE/CEG), then you should be doing your PG here in India.

And in abroad TIER 1 institutions/Universities like Standford, Cambridge, Oxford, MIT, etc.

For more information you can visit below links

https://www.careers360.com/courses/ms-master-of-surgery/amp

https://www.careers360.com/courses/m-tech-master-of-technology/amp

Thank you. I hope this answer helps you.