These are very different choices and you should first make up your mind on the choice of stream.
Here is the relevant information on each stream from the different institutions:
IIT BHU Civil Engineering is a 4-year full-time on-campus degree. The course fee for the first year is INR 2.28 Lakhs, while for the next three years, it is INR 2.13 Lakhs each. During the 2023 placements, the placement percentage for the Civil Engineering branch was 76.98%. The median package was INR 15.75 LPA and the Average Package was INR 19.09 LPA.
All the above institutions carry the prestigious IIT tag but to compare all of them that too using different courses is quite difficult. You must first choose the course that you wish to pursue and then decide which of these institutions best fulfills all your goals.
You can use the above statistics for course fees and placements to get a rough idea of each.
Your first decision must be the subject and choose the institute based on your subject of interest. As all of the above-mentioned choices have their own significance.
Economics at IIT Kharagpur
Total fees of the B.Sc. + M.Sc. Economics is INR 3.94 lacs. The faculty-student ratio here is 1:19. A B.Sc. + M.Sc. Economics graduation degree from IIT Kharagpur is of great value.
IIT Kharagpur has a reputation for its placements. In 2019-20, few students secured offers for more than INR 1 crore per annum. At the beginning of phase 1 of 2019-20 placements which started on December 1, around 1300 students had received job offers. The average package offered was INR 15 lacs per annum. Around 200 companies including Microsoft, Goldman Sachs, and Honeywell visited the college.
Electrical at IIT Bhubaneswar and IIT Mandi
A B.Tech (Electrical Engineering) degree will cost INR 7.91 lakhs at IIT Bhubaneswar, whereas, INR 8.3 lakhs at IIT Mandi.
The faculty-student ratio at IIT Mandi is 1:8, whereas at IIT Bhubaneswar there is a shortage of faculty.
The average package offered to a student of IIT Mandi was INR 13.5 LPA. The placement rate is around 82%. The average package at IIT Bhubaneswar was INR 11.4 lakhs per annum. The placement rate here was 86%.
89 companies including Amazon and HP visited IIT Bhubaneswar in 2019. A total of 112 offers were made at IIT Mandi in 2019 including offers by Microsoft, Goldman Sachs, Amazon, and Robert Bosch.
Civil at IIT Guwahati and IIT BHU
Civil Engineering at IIT Guwahati costs INR 8.59 lakhs, and at IIT BHU it costs INR 8.67 lakhs.
In 2018-19, a total of 250 companies visited IIT Guwahati. The placement rate for civil engineering was 77%. The highest package offered was INR 1.5 crores. International companies like Microsoft and Uber were the major recruiters.
A total of 52 companies visited IIT BHU last year. The placement rate was 71%. The highest package offered was INR 1.53 crores. The major recruiters included EXL, Wipro, Tata Steels, Oracle, and Maruti.
You may talk to the seniors before choosing the college. The decision must be made based on your subject preference and keeping all these facts into consideration.