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
Quality of Education
Placements
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.