Among these CMC Vellore is better. It is a great option for pursuing an MBBS. CMC Vellore MBBS is ranked among the top 5 in the country. It has a brilliant faculty base. Most of the faculty members are friendly. You can approach even the senior-most faculty members regarding any problem. 

As a tertiary care center, CMC Vellore gets many complicated and rare cases.  So, students receive valuable clinical exposure. There are good opportunities for research as well. CMC has a number of elective and exchange programs in reputed institutes like Karolinska Institute, NUS, Uppsala, etc. CMC Vellore alumni network is widespread. Students of the institute are in various positions all across the world. 

One other thing that sets CMC Vellore apart from other medical colleges is the focus on community health and development. Right from the bigging of the courses, there are classes, projects, and frequent visits to make students aware of the problems that rural and urban India are facing. CMC Vellore has one of the best community health department in the country. 

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. 

To pursue a Neurosurgery course, both colleges are equally good in their own ways. But AIIMS Delhi should definitely be your first choice.

Here’s why:

• They have a well adapted and constructive system.
• They have a huge patient load.
• You will have proper support from the latest technology, excellent guides, renowned consultants and well equipped labs and machinery.
• They follow dedicated patient management protocol, incorporating latest techniques into their surgical practice.
• They have got a cadaveric training facility with cadaveric courses being conducted from time to time. 
• They also have animal training labs where you can work on your microsurgical skills.

Delhi is a very lively city offering various opportunities through numerous national and international conferences conducted here frequently.

CMC Vellore also has a great reputation but AIIMS has an upper hand. The schedule at both places, your residency training is going to be tough. The fees at CMC are much higher than AIIMS and the salary offered at AIIMS is 4 times higher than CMC.

According to the reviews online by the students of these colleges, here’s what the ranking seems to be like:

• KGMU has mostly been ranked among the top 5 institutions in India. It usually maintained its place in rank 2 or 3. This institution is 125 years old with proper educational experience.
• AFMC is a very disciplined institution with strict rules and codes of conduct, as it has direct affiliation with Armed forces. Though being well reputed, in academics and exposure it might lag behind.
• MAMC, Grants Medical College (GMC) and IMS BHU are at a similar level.
• Some students claim MAMC to be slightly better than AFMC. 
• GMC is very popular in and around Maharashtra.
• IMS-BHU is autonomous; it has the reputation of BHU tagged along which is beneficial.
• CMC is amongst the oldest medical colleges, but their severe lack of proper facilities in this college and political disturbances have tarnished its reputation.

Therefore it is suggested you either go for KGMU or MAMC, as they will provide you with the required exposure and opportunities.