Without any doubt, AIIMS Rishikesh is a better choice than NDMC Delhi for a future abroad. Those targeting For USMLE Or PLAN should bear in mind that the AIIMS tag is very crucial for admission to foreign universities. It’s the institute that enjoys maximum global recognition. Even academically, AIIMS is way ahead of NDMC. The only advantage of NDMC is the city life and PG quota it offers which is of little use to you considering the fact that you are planning to go abroad.
If you are someone who prefers a lively city life with parties and stuff, NDMC is for you but if you are a nature lover and want to stay surrounded by serene hills then AIIMS Rishikesh is for you. Ultimately, AIIMS Rishikesh is the best choice if you are certain of pursuing your PG abroad.