Which IIM should I prefer among the new IIMs in terms of placements?

Hello, Rashmi! In terms of placement statistics, IIMs-Shillong and Ranchi rank slightly ahead of the others. https://www.quora.com/What-are-the-placements-scenarios-in-new-IIMs-in-2017

All new IIM's are good, so it depends on the location you want to live and more prominently, on the percentile you got. IIM Amritsar and IIM Rohtak have certainly some location advantage.