As per Careers360 analysis, both the colleges have got AAAA which says both are very good options overall whether you talk about Student Quality, Research Output, Impact, Learning, faculty, facilities, cut off trend, state and national ranking.

So it is advisable to choose the one as per the eligibility, cut off, interest.

Forreference, you can go through the below links -

https://medicine.careers360.com/colleges/b-j-medical-college-ahmedabad

https://medicine.careers360.com/Medicine/Bangalore-Medical-College-Research-Institute-Bangalore

Good Luck!!!