Hello,

This depends on what your interest is that is whether you would like to work or pursue your education.

If you decide to do M.Tech then IIT Delhi is the best for CSE department, followed by IIT Kanpur and then IIT Bomaby.

Now if you want to try for a government job, which os a very good option since you get paid really well and have job security, but to get into a PSU you need to get really good ranks.

I will share with you a link where you will get a clear picture of the previous year's GATE cutoff trends for PSUs.

https://engineering.careers360.com/articles/what-are-gate-scores-for-psu-recruitment

So it would be my opinion that if you score really well then you should try for PSUs since then you will be having a secured future. But of your passion is to learn then you should join M.Tech in one of the above given IITs

Good Luck