Hi Deepika,
ISB is better than IIM-A but the problem is that for ISB you need a minimum of 5-year pre-MBA experience and the program is for 1 year however for IIM-A there are no such criteria. IIM-A has both regular 2-year program and also 1-year executive program. If you have options then for regular 2-year MBA go for IIM-A and for 1-year executive MBA it's ISB any day.
Good Luck!
IIM A is a government college & ISB is a private college. As per the analyzing report of Careers360 IIM A has AAAAA rating which means Exceptional & has All India Rank 1 & ISB has AAAAA rating which means also Exceptional. You can check the placement of the colleges with the given below links.
https://www.isb.edu/pgp/careers/placement-trends
https://www.iima.ac.in/web/pgp/placements/student-profile/final-placements
You can also check the genuine reviews of the colleges with the given below links.
https://bschool.careers360.com/colleges/indian-institute-of-management-ahmedabad
https://bschool.careers360.com/colleges/indian-school-of-business-hyderabad
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