Hi,

Both the institutes are private institutions and is  good for pursuing management studies. Both of them have excellent academic history and have good rating. The IIMS offer PGDM courses while the PIMR offers full time MBA with various specializations. My humble request is to to go for IIMS because it have comparatively high ratings in terms of placements and infrastructure. It is only a suggestion since the outcome of every course is based on performance of students. You can also use the college comparing tool given to compare the colleges of your choices and choose best option yourself

https://www.careers360.com/compare-colleges

All the best.