I would suggest you choose Athena over IBS. While both are in Mumbai, their teaching methods are very different. IBS emphasizes batch size, quantity (1000 students for the Mumbai college), a highly easygoing college life, and a curriculum with only one internship. Because there are no international internships or exchange programs, global exposure is not prioritized.
Athena focused on Corporate Connect, Quality of Intake (only 60 to 70 students), and a very demanding and busy education with many internships. There is a lot of foreign exposure with two overseas immersions and one international internship.
When it comes to jobs and placements, Athena has an average of 7.00 lacs each year and a large number of Pre Placement Offers. This means that all of their students receive jobs, with the exception of those who opt not to go through the placement procedure. IBS earns an average of 6-7 lacs a year, yet 200-250 students do not get jobs. This is a major issue when there are so many new students each year.