My brother is an alumnus of IET Lucknow and was able to shed some light on the differences between IET Lucknow and KNIT. 

• IET Lucknow has a higher brand value than KNIT Sultanpur. 
• IET Lucknow provides a better environment and exposure because it is located in the heart of the city and is well-connected to the rest of the city. 
• In comparison to KNIT, you can find students with good grades at IET Lucknow. In comparison to KNIT, placements at IET Lucknow are significantly better. According to the recent placement statistics the median CTC offered at IET is around 4.5 LPA. While the average CTC offered at KNIT is 4 LPA.
• In terms of academics and infrastructure also, IET is significantly superior. 

If you are in KNIT, you would have to travel to Lucknow or Allahabad for any placement drives or tests, as most firms or companies will not travel to the college in a rural area for placement drives.