Hello,
While it is a bit ambiguous with what you are comparing NIT Surathakal Nanotech. But talking in general, these two colleges are more or less in same level. If a company visits either of the two colleges, it generally visits the other too.
Speaking of general placements, past recruiters of both the colleges features traditional heavyweights. Even in the department like nanoscience. You will be having a secured future and can think of other parameters leaving placements aside.
Personally speaking, I going for NIT Surathakal might be a better option keeping in mind it's location and other things.
Hope it helps.
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