Hello Aman,
Both are one of the top institute in India. There are many differences between NIT Surat and NIT Allahabad. I am giving you some of them which will help you. B.Tech Mechanical Engineering in Sardar Vallabhbhai National Institute of Technology Surat has lower fees. B.Tech Mechanical Engineering in Motilal Nehru National Institute of Technology Allahabad has lower cutoff through JEE Main. Both the colleges have almost same seats, that is, 120 in NIT Surat and 123 in NIT Allahabad. Placement for NIT Allahabad is better than NIT Surat.
Hope this helps you.
All the Best.

SVNIT Surat

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MNNIT Allahabad

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