All of these AIIMS are on equal levels with one another. Infrastructure, faculty, and facilities are remarkably similar, so don't undercut any of them. So, excluding these, make your decision based on personal factors.
Remember that it is a common misconception that Raipur is unsafe and least developed. AIIMS Raipur is a wonderful institute that none of you regret attending. They have also achieved some outstanding results in PG. So give it some thought and join any of the institutes you want.
One of my friends studied at AIIMS Bhubaneswar. Let me share his experience during his first year. This will give you a clear idea.
Your first year will be supersaturated with enjoyment, love, discipline and you will make loads of memories. You will realize that getting admission here at AIIMS Bhubaneswar is one of your best decisions.
AIIMS Bhubaneswar is better than state medical colleges in many aspects. Here are some points to support this statement.
Obviously, there are many more improvements required but being a new college AIIMS Bhubaneswar is better than state colleges when everything is considered.
Also, the college is very strict about studies. There are fewer holidays and many exams so getting free time is a bit difficult but not impossible.