Students who join IET Lucknow tend to have higher ranks in JEE (Mains) than JIIT Noida. But JIIT Noida is mostly preferred by students, here’s why:

Location

• Due to its location, JIIT Noida is mostly preferred. Being closer to Delhi, it has access to nearby corporate houses and IT firms.
• Students get to attend seminars and industry visits quite often.

Quality of Education

• The faculty is much better at JIIT Noida. Being a private institution, it provides personality development and other exposures.
• Students tend to follow a routine and are disciplined.

Placements

• JIIT Noida is better than IET Lucknow in placements for sure.
• The CSE department is the best among others.
• The highest and the second-highest salary offered at JIIT Noida to the batch of 2016-20 are INR 43.17 LPA by Adobe and INR 34 LPA by DE Shaw.
• CSE is also the best branch at IET Lucknow.
• Students get placement offers from Microsoft with a salary of INR 37 LPA. However, on average it is decent.
• Bharat Electronics Limited (BEL) is a regular recruiter at IET Lucknow for ECE students.

Being a government-run college, IET has far fewer restrictions than JIIT Noida which appeals to many students. But it lacks in personality development and other exposures which you will get at JIIT Noida.

Now that you have known about both the colleges, I think you can clearly understand yourself and make a choice according to what you need.