What should I prefer, a PSU or an M Tech? How is an M Tech at IISC Bangalore? Also, which PSUs recruit fo3r R&D sectors through the GATE?

These questions need to be answered step-wise:

• What should you prefer, a PSU or an M.Tech-  Analyze your strengths and weaknesses and make a decision based on your preferences. If you go by what others say, you might not be satisfied with the result in the future. Some people join the workforce after their matriculation but their hard work makes them reach senior-level management positions. You need to choose between a PSU or an M.Tech, both are equally good options but it is your individual preference that is of significance.

• How is an M.Tech at IISc Bangalore-  M.Tech from IISc Bangalore is a good choice if you wish to go for your Ph.D. 

However, if you do not wish to get into research after your PG and instead plan to join the workforce, I would suggest you to rather go for IIT Bombay or IIT Kharagpur.

• Which PSUs recruit for R&D sectors through GATE:  You can check the advertisements of a particular company.  Most of the time companies mention the roles for which they require candidates. Go for an M.Tech from an IIT as it will improve your chances of securing a position in the R&D sector. The chances of getting a job in the R&D sector after an M.Tech get high.

Thus, I have made an effort to give you my perspective on this question and share my knowledge to help you make a more informed choice.