It totally depends.
It depends on your current career status, your growth trajectory and if you want to do a career switch and many more such factors.
Let us be very specific in this answer.
This answer would be from a perspective of a IT software guy, who has turned around 26, has stagnated in career, and makes, say 09 LPA. (Around 75k per month)
This is where the majority of people are stuck, and this is the largest applicant pool for a B School.
Now, let us say, he has cracked the flagship programmes of both ISB and IIMA.
With a WorkEx of around 4 years, and strictly from a monetary perspective, let us analyze both the scenarios. I am including the average ROI (Return on Investment here as well, so that everyone can understand it from scratch)