IT at IIIT Allahabad is better. In all aspects such as academics, placements, exposure, etc. It is well ahead of NIT Jamshedpur.
According to the recent highlights of IIIT Allahabad placements, the average package offered to IT students is around INR 21 LPA. Many top-tier companies take part in the placement drive. Google, Microsoft, Directi, De Shaw, Goldman Sachs, etc. are some of the major recruiters that take part in the placement drive.
Both NIT Jamshedpur and IIIT Allahabad are very good engineering institutes, but IIIT Allahabad is way better than NIT Jamshedpur in almost every aspect like placements, infrastructure, coding culture, rankings, etc. Actually, IT at IIIT Allahabad is better than CSE at all NIT except for NIT Warangal, NIT Trichy, NIT Surathkal, and MNNIT Allahabad.
Here, IIITA is a better institute than NIT Jamshedpur and provides better facilities to its students, and is also ranked among the top engineering institutes of our country. So it will be a better choice to choose for IIIT Allahabad.