Yes, and also see that this year's DSE toppers went to ISI-D, not to ISI-K, this might be due to the fact that the toppers were SRCC alumni and wanted to stay at Delhi at any cost, but though I think ISI-D is good for rigorous studies.Faculty is also good at Delhi.
The problem with me is only that I know about Delhi center bit more, but don't know too much about Kolkata center. So, I really need advice.