Hi Abhinav

All of the three colleges are of national importance.There will be no issue of infrastructure ,placements,faculty...etc.etc.

You can feel relaxed for any of the colleges you have mentioned .There are slight ups and down but eventually if that matters you can analyse by yourself once.

All Three are Tier1 college.

• the most sought after career in IIT is programming and Data Science, and in both of which the reputation of ISI and IIT are similar.
• Financial Firms are exclusive recruiter at IIM C.
• ISI is far better in terms of placements.(almost 100%)
• At IIT large culture and alumni network

Choose according to your priority.

Good Luck