Hello, both colleges are good and top colleges of Upsee exam , are government college.
I would recommend you to go for IET Lucknow as it is ranked higher then KNIT Sultanpur and is located in Lucknow so you would also get a good environment and big city, also there is IIIT Lucknow in Lucknow so , this is also a good thing. Otherwise if your home is near Sultanpur then you can also go for KNIT.

Check this link for IET Lucknow

https://www.careers360.com/colleges/institute-of-engineering-technology-lucknow

Check this link for KNIT Sultanpur

https://www.careers360.com/colleges/kamla-nehru-institute-of-technology-sultanpur

All the best.
Hope this will help you.

IET Lucknow

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JNEC Aurangabad

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KNIT Sultanpur

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