Hi Prabhav,
Each of the institutes have its own conveniences and betterthings to opt for.
KNIT is affiliated to Dr. A.P.J. Abdul Kalam Technical University and has been ranked amongst the top engineering institutes under AKTU. 
Where as, Vellore Institute of Technology is a private deemed university and an Institute of Eminence located in the outskirts of Vellore, Tamil Nadu, India. It is one of the top engineering colleges of India. It was ranked NO. 1 by NIRF - ARIIA in 2019 among private engineering colleges.
In my opinion, VIT vellore is having better placement records comparing to the other institutes. The faculty, infrastructure and other facilities are good in VIT vellore as well as KNIT.
The comparison between VIT Vellore and KNIT is given below, https://www.careers360.com/compare-colleges?college=46420-4851-course=54397-28295-compareresult

Im sharing the link where you can get a much detailed review of each of these colleges here below,

• KNIT https://www.google.com/amp/s/www.careers360.com/colleges/kamla-nehru-institute-of-technology-sultanpur/amp
• VIT chennai https://www.google.com/amp/s/www.careers360.com/colleges/vit-university-chennai/amp
• VIT vellore https://www.google.com/amp/s/www.careers360.com/university/vellore-institute-of-technology-vellore/amp

Please go through the link for further reading.
Hope this helps.
All the best.

Hi Prabhav,

Every college is good in its own way and every college has some advantages and disadvantages, you have to consider certain factors before applying for an admission in college.

To Compare college based on different factors you can use our college comparision tool: https://www.careers360.com/compare-colleges

VIT Vellore

Admissions Courses & Fees Placements Reviews

Shortlist

Brochure

VIT Chennai

Admissions Courses & Fees Placements Reviews

Shortlist

Brochure

KNIT Sultanpur

Admissions Courses & Fees Cutoff Placements Reviews

Shortlist

Brochure