Hello,
I hope you are doing fine, Both are almost same. IIT Guwahati is older one and it is one of top 7 IITs. NIT Trichy is no.1 NIT. If you are getting Both then can surely go with IIT Guwahati as the kind of projects and learning opportunities you might get at IIT is unparalleled with any other institute (even for elite NIT Trichy). For NIT Trichy it is close to Chennai, the powerhouse of startups and innovation. Many Companies have there branches there. You will be getting many opportunities for interns outside your college at NIT Trichy but for IIT Guwahati there are not much companies so opportunities are also less.
I hope you find this information helpful. I wish you all the best for your future.
Good Luck
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