IIM Ahmedabad is definitely one of the best institutes for studies. But it’s not the only one with excellent opportunities. Many other colleges offer better opportunities and a wide range of career options than IIM Ahmedabad.
Many people get selected in IIM Ahmedabad but do not join it. This is because their career goals do not restrict them to IIM Ahmedabad only. One such example is Sudhakar Gupta from NSIT who scored a 100 percentile in 2014. He got selected in all the IIMs but instead chose to pursue a Masters Degree from Cornell University.
At the IIMs, while the career opportunities are excellent, they are more or less streamlined and restrictive in the initial period. So people with broad prospects tend to suffer here.
It depends on your long term career goals and your own conveniences at the end.