Every college mentioned in your question is widely acceptable and notable in the Delhi-NCR region. The best among all of them is IILM University Gurgaon with a strong alumni base of 12000 members.

You should go with IILM due to the following reasons:

• It offers one of the best MBA degrees in the nation, approved by UGC. The other three colleges however offer only PGDM courses affirmed by AICTE.
• The teaching method is a mixture wherein students apply information and data to their thoughts and ideas.
• The curriculum has the best topics covered at top business colleges all around the world. The modules are inspired by Stanford Graduate School of Business, Wharton Business School, and IIM Ahmedabad.
• Practical exposure is given via live projects, internships, business simulations, and many more.
• You will be assigned a personal mentor at the time of admission. They will act as a trusted advisor and will guide you throughout the program for 2 years.

Placement opportunities at the university are also great. The batch of 2020 received the highest package of 7.5 LPA. You will learn from industry professionals and have great industry exposure.