Which one is the best, a dual degree in economics at BITS or ECE at NIT Calicut?

Both the fields are greatly different. One lets you deal with finance and the other with mobile and technology. It completely depends on your interest.

ECE from NIT Calicut seems to be a better option. Because if you opt for it you will just have to brush up your knowledge on physics and learn more about it. Whereas economics will be a new subject and it will take a lot of time to learn it from scratch.

• In terms of college, BITS is surely a better option than NIT Calicut. But it’s not just about college, an NIT CSE graduate can land a job in Google and earn a lot. 
• Whereas somebody from IIT with Civil would have to compromise as there are not a lot of jobs offered in that field. 
• If you are interested in pursuing M.Tech from India or abroad or if you even want to have a great job, in the beginning, ECE from NIT Calicut is the best option. 
• But if you want to learn economics from scratch and pursue it to become an economist then economics is also a good option. 

Therefore, you must look into your interests and not opt for anything which just looks good. ECE is a circuit line and jobs are plenty in them too. So taking up ECE at NIT Calicut is a better option.