AIIMS Delhi as we all know is the best institution in the country coming at par with some of the best world institutions like Mayo Clinic In terms of research outputs. Both the department you have mentioned have ample infrastructure with high end devices. The faculties are authors of major medical books and boosts numerous research papers in both Indian and International journals. They shall be your guide, so be sure to get the best. Coming to patient inflow, AIIMS Delhi have a 10000+ daily inflow and so you get every type of patient and ample sample size to conduct any research related activities. For Anatomy too, the vast anatomical differences in individuals body provides a great scope for learning and research.

Coming to AIIMS Rishikesh, although it cannot boost infrastructure like Delhi, but I am pretty sure it has the basic minimum to allow smooth learning in the course. AIIMS never starts a course until they are fully sure they have the basics. With moderate patient flow and a robust in faculty comprising of teachers from prestigious instiTunes like AIIMS Delhi, PGI you are sure not to loose anything.

If you get a good rank join Delhi else Rishikesh is more than fine.

Hello Nived

AIIMS New Delhi is one of the top colleges and AIIMS Rishikesh is a new institution but the infrastructure and faculties of the college are good. It has a beautiful campus.
All the other facilities provided by both the institutions are also good.

Good Luck!