Maulana Azad Medical College (MAMC) is definitely better than every other AIIMS. Though there are chances for AIIMS to grow in the next 3-5 years. But opting AIIMS over MAMC is really not recommended.
MAMC being a more older and experienced institution has provided its students with some of the best opportunities. But that does not mean that AIIMS is lagging behind. As it is also growing and providing students with the appropriate amount of exposure.