Which is better, NIT Trichy CSE or Jadavpur University CSE?

NIT Trichy is definitely better than Jadavpur University and NIT Trichy. Following are the reasons for the same:

• NIT Trichy has a better QS world ranking than JU.
• It has a great entrepreneurial culture. Many of the alumni of the institute have moved on to found technological and social ventures in India and abroad. They can be found in the list of CEOs in some companies that are listed in Fortune India 500 and Forbes Global 2000. 
• NIT Trichy also has a good placement record. In 2021, the average CTC offered was 6 LPA.

Jadavpur University is also a reputed institute. With time the quality of education at JU is also improving. So, I will suggest you do your own research and choose an institute that works best for you.