Hello, both are good colleges and old Nit.
But this also depends on your interest in which branch you have interest.

In my opinion you should go with Nit Agartala Mechanical Engineering. As Nit Agartala is highly reputed and highly ranked Nit in Nirf ranking.
Placement wise, Infrastructure wise and faculty wise you will find good opportunity here.

Nit Srinagar campus is very good but mechanical engineering from Nit Agartala is a very good option.
If you study well, you will get good opportunity for placements.

Refers to this link for details about both colleges

https://www.careers360.com/university/national-institute-of-technology-agartala


https://www.careers360.com/university/national-institute-of-technology-srinagar


All the best.
Hope this will help you.

NIT Srinagar

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NIT Agartala

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