I will suggest you to go for CS in KNIT Sultanpur because ECE in IET Lucknow is not good. In IET you will not get good teachers and their placement record is also not that much good as that of KNIT. Whereas, KNIT has good placement record. The highest package was given by Amazon of 8.65 lpa. Also CS branch is in demand now a time, so there is no loss in taking CS in KNIT Sultanpu.