For a BTech in CSE, IIIT Delhi is way better than MNNIT Allahabad. It has better academics, curriculum, infrastructure, faculty, research facilities, and placements. IIIT Delhi has a pretty active coding culture as well. Each year, almost 100% of students get placed through campus drive at IIITD. According to the recent placement highlights, IIIT Delhi CS average package is around INR 17 LPA. 

You should prefer COEP IT. It is among the top engineering colleges in Pune. The institute offers better academics, faculties, and placements. Each year around 95% of students get placed in the IT branch. The recent highlights of COEP Pune placements show the average CTC for IT to be around INR 10-11 LPA. Barclays, Goldman Sachs, Amazon, etc. are some of the major recruiters for the IT branch.

The video below gives you an overview of COEP IT

So, it can be concluded that COEP IT is a better option than IIIT Pune CSE