To decide which IISER to choose, here are the important factors to consider when comparing the five fully established IISERs - Kolkata, Pune, Mohali, Bhopal, and Thiruvananthapuram:
IISER Kolkata and Thiruvananthapuram would not be recommended due to various factors.
Here's how to rank the five IISERs based on preference:
Pune and Mohali (equal preference) > Bhopal > Kolkata > Thiruvananthapuram
IISERs are not comparable to each other as all of them have the best faculty, laboratory facility, and provides an excellent education. Every campus is equally good in terms of academics.
Lastly, we can conclude by saying that new IISERs are being set up with the motive of providing opportunities to research-based undergraduates with uncountable facilities that are being provided to all the students. Making the comparison between the different IISERs is not ethical as all of them are equally good.