International Management Institute, Delhi offers PGDM (Post Graduate Diploma in Management) whereas Sikkim Manipal University-FBMIT offers Post Graduate Diploma in Business Administration (PGDBA). Course fees of IMI Delhi is Rs. 15.26 Lakhs and SMU is Rs. 63 Thousand.
IMI Delhi have 5th Rank in MBA Colleges in India, it is autonomous and admission is through CAT scores. SMU Gangtok is a private university. Both are AICTE approved. Infrastructure facilities are present in IMI Delhi.
If you want to study in a top College then prefer IMI Delhi but if you have fees or location issue you may go for SMU.
For further reference use this College compare tool