Which is better: Mech in IIT Madras or CSE in NIT Trichy?

The choice of the branch, as well as the Institute, depends on a lot of factors like your personal preferences and the other options you have. It’s difficult to say which is better between the Mechanical Engineering program at IIT Madras and CSE at NIT Trichy, as both are highly reputable institutions with strong engineering programs. Both offer excellent curricula, experienced faculty, and ample opportunities for research and extracurricular activities. 

Joining NIT Trichy for CSE is a good choice if

• You are more interested in computer science and software development
• If you are only after the CS roles and placements. The placements of this branch are pretty good at NIT Trichy with the average package at INR 17-24 LPA and placement rate at 98-100%.
• If you want to pursue higher studies in MS

Joining IIT Madras for Mechanical Engineering is a good choice if

• You are looking for an amazing campus life and the IIT tag
• You are open to non-core jobs because core Mechanical jobs are average. 
• If you want to start a career in CS by learning to code or taking minor courses in CS

Some other options to consider are

1. CSE at IIIT Hyderabad or new IITs
2. ECE at IIT Guwahati 
3. EE at IIT Hyderabad 

All these have average packages above 20 LPA and are excellent options. The preference order for branches on the basis of job prospects and the current demands in the market is as follows

CSE > M&C > ECE > EE

All these branches are open to software profiles whereas other branches usually offer non-core profiles even Mechanical. Ultimately, it's important to research both programs and consider your own interests and goals before making a decision.