How is IIT Mandi CS vs. IIT Roorkee for mechanical?

The IIT Mandi CSE program is relatively new and is still gaining recognition. However, the faculty and facilities for CSE at IT Mandy are brilliant. IIT Roorkee's ME program is well-regarded and is considered to be one of the best in the country. Both institutes enjoy a good reputation, but IIT Roorkee has a more established mechanical engineering program. The suitability of the program depends on your interests and preferences.

The CS program at IIT Mandi is great. IIT Mandi has a good coding environment in addition to several GSoC selections every year. You will see active participation of students in coding competitions right from the first year. 

It’s better to explore both branches ME and CSE and then after analyzing your interest, 

You should explore your interest in both mechanical and CS as the branch is the most crucial determining factor of your career. This is because CS might not seem easy to those who lack interest in the same. 

It would be best for you to visit the websites of both institutes and compare the program details, faculty, research, and facilities to decide which one would be a better fit for you.