It depends on various factors and individual taste .
If you want to go to ISRO, DRDO , etc go for GATE, Mtech.
If your aim is Big MNCs and product companies like FaceBook, Microsoft go for MS, though it can be achieve through Mtech also , but through MS it is quite easier.
If you dont want to leave your country Mtech
If your passion is teaching then Both Mtech and Ms
If you are not financially strong then Mtech.
List is very long … Go for what your hearts says to you