Hello dear

All the 3 colleges- NIT Allahabad, NIT Calicut and NIT Warangal,are equally good. They have been established long back and have been running successfully since then. All 3 are highly reputed and have been ranked AAAA+ on the Careers360 portal. If you compare the ranks EE and ECE, you need to know that both run parallel. Both have similar placement statistics and have great companies recruiting the students. Coming on the statistics, NIT Allahabad's highest and average package is the highest, while NIT Warangal's statistics is almost the same, and NIT Calicut's being the lowest. JEE mains closing rank is also the lowest for NIT Calicut. The course fees for NIT Warangal is the lowest, while for other it is the same.Besides this, the campus life is similar for all the 3.
Now, I would recommend you to choose your option on the basis of location and the above mentioned points. Check the proximity of the campus and means of travel. If you want to know more, you can refer to the college comaprison link- https://www.careers360.com/compare-colleges

I hope this helps you. All the best!!