Every college is good in one or the other aspects. Its location, faculty, and infrastructure are the main factors that determine a college's priority. The following list contains the colleges in order of priority based on their pros and cons.
Pros:
BHU: No requirement to sign a bond
Seth GS: Located in Mumbai with the best academic structure
KGMU Lucknow: The location and academic structure are perfect.
Other AIIMS: No need to sign any bond and the fee structure is affordable. AIIMS tag can help you with USMLE purposes.
Cons:
BHU: Located in Varanasi, it lacks the facilities of metropolitan cities like Delhi and Mumbai
Seth GS: Mumbai is expensive and a bond of 1 year needs to be signed
CMC Vellore: You will have to learn Tamil as it is located South India. The fee structure is pretty expensive.
Other AIIMS: They are usually not located in a good location except for Bhopal and Bhubaneswar.
The preferred order as per the pros and cons can be - BHU> AIIMS> KGMU> Grant> Seth GS> CMC Vellore
One college can be good for you but bad for others. This is because your own needs determine which college is best for you. So choose wisely.