Every AIIMS is good and not much comparable. But if you compare it to AFMC, there are some things you need to know.
Firstly AFMC has a bond of 1 cr rupees if you want to quit after MBBS. But the infrastructure of AFMC Isi is exceptionally good. It just does not provide you the basic medical facilities but trains you in shooting, swimming, working in challenging conditions, daily PT, etc. All this will prepare you for a tough future.
The best part of AIIMS on the other hand is no bond is required to be signed. AIIMS focuses on medical facilities only. The classrooms are well-designed. The library, playground, gym, and other facilities add to the overall infrastructure of the college.
I will recommend that you go for AIIMS if you are willing to pursue PG right after MBBS. AFMC on the other hand lets you pursue PG only after serving for a fixed period of time. But don’t worry, the internship offers a good amount of money.