I have a lot of friends who are doctors today and have completed their M.B.B.S. from either CMC Vellore or AIIMS. I can easily answer your question.

• Most graduates after completing their M.B.B.S. from AIIMS prefer either settling abroad or aiming for higher education while CMC graduates mostly continue their higher education at CMC itself.
• CMC students are required to do bonds in missionary hospitals and their higher education is their second priority. They provide social services in the form of healthcare facilities in remote areas of the country and contribute largely to society. AIIMS students' priority is usually a high-paying job or an excellent university for higher education.
• AIIMS graduates are more skilled in research and thus tend to publish more than CMC students.
• CMC students have more real-time experience than AIIMS students and possess great clinical and surgical skills. They can transform their theoretical knowledge into practical approaches way earlier than AIIMS students.
• CMC gives more preference to Christians and thus non Christians find it difficult to undergo training from MBBS to super-specialty at CMC.

Here is a video that gives an overview of CMC Vellore

These are some major points of comparison I have observed between my graduate friends from the 2 institutes. 

No, KIIT is not a better option than VIT, Manipal, SRM, or even average NITs. this comes from the experience of several relatives of mine who are alumni of KIIT. Other mentioned institutes are better than KIIT in terms of education, exposure, and crowd quality. But if you are still adamant about KIIT, consider joining it only under the following circumstances

• If you are a local staying in Bhubaneswar you can save a lot of money by not availing hostel facilities thus the ROI will be more than SRM and VIT. 
• If you are in need of regular counseling or have to come back to your house for some purpose and you hail from Bihar, Jharkhand, or Orissa, then KIIT might be a better option. This is because some engineering students fail to receive proper guidance and affection from their families because of studying in a far-off college.

I will end with a note that your college doesn't really matter. What matters is the right mindset, aspirations, books, and knowledge. If you have all these, you will certainly succeed!

Let’s talk about the advantages and disadvantages of these options before choosing one of them. 

RBI Grade B - 

• RBI comes only after UPSE. Considering the political pressure of UPSE, RBI can be the best job in India.
• The salary package is similar to the median CTC offered at IIMA.
• RBI has great job security, irrespective of the ruling party. Govt. policies like privatization won’t affect RBI.
• Posting will be always in the state capital.
• RBI jobs have a great work-life balance. 

IIMA - 

• Batch size of IIMA is over 400. You will have to do exceptionally well to stand out from the crowd and bag offers from top investment banks and consulting firms. 
• The course fee for the PGP is INR 23 lakhs. This can be burdensome for some students. Even if you get an INR 25 LPA CTC, after paying education loans, tax, EMI, etc, you will have around INR 1 lakh in hand. 
• Many quit investment banking jobs or consulting jobs after a few years due to huge job pressure. 
• The Covid-19 recession caused many recruiters to withdraw their offer even for IIM A,B,C. There are a number of things that can affect final placements. 

Factor in all these points to make the decision that’s best for you.