Hello Student,

IMI kolkata ranked 52nd overall among management institutions in india by NIRF in 2020
Infrastructure provides excellent facilities.
Entire campus is WiFi enabled.Classroom lectures are updated with the latest audio-visual equipment
IMI Kolkata is also a part of Study in India programme,under Ministry of human resource development, Government of india... Very few higher educational institutes in India are part of such educational programmes.
Campus placement record for this institution is very good.

ITM navi mumbai also has its own good record.
Infrastructure provides Facilities like library,auditorium,well furnished classrooms, hostel facilities,etc.
Deloitte, PwC, SBI, KPMG, and E&Y,these are some top recruiters visiting ITM navi mumbai.
This is also well known institution for quality education and excellent placement record.

See,both the institutions you mentioned in your question are best.but which one to choose is completely your desicion.both institutions have their own popularity!!!
Still,you should consider some other necessary factors like fees structure,eligibility criteria,college location,required facilities.and also related factors,etc.while selecting the college.
Hope this helps
Good luck..!!!