Both AIIMS Bhopal and Seth GS Medical College are great. But choosing AIIMS Bhopal over Seth GS Medical College wouldn't be an wiser option. Cause AIIMS Bhopal is quite a new college while Seth GS Medical College is one of the oldest medical colleges of India. Not only this, Careers360 has ranked Seth GS Medical college at 13th position among top medical colleges of India. Being a new college, AIIMS Bhopal is still in it's developing phase. But Seth GS medical College has been great throughout years. All the facilities are provided properly. Being a medical college hospital from a busy area, the patient flow is quite good and you'll get enough exposure than AIIMS Bhopal. However the patient load is quite heavy at AIIMS Bhopal but this Institute has not yet received any remarkable rating or recognitions yet. It has been attached to KEM Hospital which is one of the biggest hospitals in Mumbai. Still you can think about it one more and read the student's reviews for more details
http://www.careers360.com/colleges/seth-gs-medical-college-mumbai
https://www.careers360.com/university/all-india-institute-of-medical-sciences-bhopal