I would suggest you to go for JMI Delhi. The reason for this is that JMI is very similar to the NITs. The environment and crowd are top-notch. Seniors at Jamia are also very helpful and cooperative. 

The professors and other members of the faculty are well-experienced. They even help you plan your career after college. JMI alumni help you out in getting jobs and a decent salary amount.

The table below depicts the placement scenario of JMI and IET:

Though it is your decision to make, I still would prefer the fact that you choose JMI Delhi over IET Lucknow, for CSE or ECE. Studying in a well-reputed institution with years of educational experience is much better. This will help in networking as well.

NIT Manipur offers a tremendous and technical environment for the ECE department. The institute ranks 148th in the engineering category by NIRF 2019 ranking and produces quality engineers in the industrial area. The placements for the ECE department is almost 70% every year. 

On the other hand, Jamia Millia Islamia stands proud for its NIRF rankings of 26th among the top 100 universities of India and providing 100% placement record for all its degree programs. 

Admission process:

NIT Manipur:

• The minimum eligibility is 10+2 with a minimum aggregate of 75% marks. 
• The candidates have to pass the JEE Main exam followed by a JoSAA counselling to get admission.
• The seats allotted for this course is 30.
• The total fees required is INR 1.48 LPA.
• The cutoff required is 12980 - 21991.

Jamia Millia Islamia:

• The minimum eligibility criteria is 55% marks in 10+2.
• The fees required is INR 16,150.
• The cutoff required is 0-5349.
• The seats alloted is 40.

Placements:

Jamia Millia Islamia witnessed the participation of 52 companies and extended 257 job offers in 2019.

NIT Manipur provides 100% placement records. The highest salary offered is INR 43 LPA by Microsoft.

The top recruiters are Amdocs, HCL, Mphasis, Microsoft, IBM, TV9, Wipro, TCS, Cognizant, Accenture, etc.

Faculty:-

The teachers in both these institutes are well-qualified and always inspire the students in every aspect. They help the students by conducting mock interviews and training sessions so that the students can crack the interview smoothly. 

Jamia Millia Islamia ranks 27th as compared to NIT Manipur, which is 148th. Jamia Millia Islamia is located in Delhi that provides a lot more options for higher education, internship opportunities, etc.

The fees at Jamia Millia Islamia is also less compared to NIT Manipur. Therefore, Jamia Millia Islamia should be the 1st choice for pursuing ECE than NIT Manipur.

I have cousins from both NIT Goa, and Jamia Millia Islamia and as they mention, the latter is famous for its CSE course. Usually, students do not leave the opportunity to go for the CSE course of Jamia Millia Islamia.

• CSE is comparably better than most of the other branches in the educational domain. 
• CSE provides you job opportunities in accordance to what you have been exposed to, academically. 
• On the other hand, ECE is undeniably a good choice of stream. 
• For securing a good job position, you will have to pursue majoring in one of many programming languages or web development projects. 
• This translates to studying for your course and also pursuing something extra for exposure. 
• While CSE students are already part of studying these domains in general. 
• ECE students usually also go for the GATE exam. 
• However, the only upside ECE students enjoy is finding the slightest amount of vacancies in PSU, while CS students are somewhat one step lower than it. 

Apart from these few, it depends upon how hard you work. Be it ECE or CSE, you have to work hard and utilize the time and opportunities you get while studying in college.