Hey

We cannot compare old NIT with new IIT because it all depends on facilities and faculties available and infrastructure to some extent in case of hostels.

So, I would suggest you go with the branch you want to take and research on the faculties available there and take your decision.

Generally, I have seen people go with old NIT as they are well established with good alumni network, good faculties and better research environment. Newer IITs need time to get established upto that level

All the best and stay positive:)