This answer may vary from person to person but Maulana Azad Medical College (MAMC) is a well reputed and much older institution. Hence it has years of educational experience. On the other hand the AIIMS are relatively new and require a lot to learn and develop to be considered at par with MAMC.
MAMC:
Other AIIMS (except New Delhi):
Therefore, MAMC, overall, is much better and reliable as an institution. MAMC promises certainty. So it will be better if you go for MAMC. AIIMS Bhopal, Bhubaneswar , Jodhpur and Rishikesh are developing fast, but AIIMS Patna, Raipur, Nagpur and Guntur are still lagging behind.