Am I doing a mistake by leaving NIT Trichy mechanical and taking MNNIT/IIIT Allahabad CSE?

In present times, two different departments cannot be compared overall. Making a judgment about two different streams with different levels of opportunities is not wise in the field of engineering. In this case too, the points below state the reasons why the two choices are incomparable.

• The foremost thing in the choice of streams is your interest. You should stick to your own passion and subjects of interest, which is very important for success.
• Students should never go with what the trend says. Even, someone else’s compulsion should not affect very much the choice of a student. Going by the trend is a fool’s task, as the trend may change any day. Only self passion will drive you towards success.

Therefore, it is absolutely wise to switch between the options given in the question, with the only mandate that you should listen to your mind before making the choice.