Hello there. Hope you are doing good. I would like to tell you both are considered to be decent business schools in Kolkata. Praxis is focused more on Business Analytics specialization MBA. It has good curriculum along with many placement opportunities. But if you are looking for a general MBA program, then IMI could be a better option for you. IMI is considered to be one of the top business schools in West Bengal. Comparing the placement records and the the companies visiting the campus, IMI can be a better option for you.

I hope you found this answer helpful. Good luck for you future.