Dear aspirant
IIIT kancheepuram is a good college as compared to other NITS and also all IIITS are having great placement record. So according to your question I will prefer you to go for IIIT. Try to search which IIIT is having metallurgy. Because this subject has a good scope in present as well as in future also. NIT is also a good college you can go for it but IIIT is far better than NIT.
All the best
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