What is better, placement-wise, IET Lucknow CS or JSS Noida CS with a fee waiver seat?

JSS Noida will be a better option for you. The location factor is also very important. After completing course, you can easily get a job in any of the IT in Noida. The off-campus chances of getting placed are also high. You will also get good industrial exposure in the JSS Noida college. The college is very strict in attendance. The company has got a lot of placement opportunities. The labs and equipment of the college are also well equipped.

IET Lucknow being a government college is good for core branches only. The CS and IT branch of the college is not that good. If you are planning for GATE and other competitive exams. you might get ample time for that because there is no such attendance system.