Hey aspirant,

I wouldn't be able to suggest you with which branch you should go for.As,this is a really important decision amongst the students.You should only go with that branch in which you feel you are more comfortable and interested.It's but obvious that you wouldn't want to waste your 4 years of life in studying something in which you are not at all interested.

Also now, talking about these three colleges on the basis of their placement statistics then the highest package offered by MNNIT allahabad is 36lpa and average is 7lpa.

for a brief knowledge of placement statistics of MNNIT please refer to the link mentioned below-

https://www.google.com/amp/s/engineering.careers360.com/articles/mnnit-allahabad-placement-report-2018/amp

Whereas the Highest package offered by NIT TRICHY till date is 52lakhs whereas usually it ranges around 25-35lpa and average ranges around 7-8lpa.

For more details you can refer to the link mentioned below-

https://www.google.com/amp/s/www.careers360.com/university/national-institute-of-technology-tiruchirappalli/amp

Now, talking about NIT warangal then the highest package offered is 43lpa and average ranges around 12lpa.

For more detailed information about placement statistics of NIT warangal please refer to the link mentioned below-

https://www.careers360.com/university/national-institute-of-technology-warangal/placement

Now, at last I would say that all these colleges are at good place in terms of placement so on the basis of your interested branch you can go for any one of these. :)

Hope it helps!

All the best!