One of my cousins who did a Ph.D. said that choosing a college clearly depends upon the area of interest you have in mind for the research.

• It would be good if you start researching the professors of the colleges. If their field of expertise matches the field you wanted to opt for, then it’s a win-win situation.
• Well, If we talk about JNU I have been informed by one of my friends who did PhD from JNU that this university focuses on hardcore research. Moreover, it has a good number of professors who have decent experience in research.
• Whereas, DSE offers a master’s program that helps students to apply for corporate jobs. Thus, this institute is quite quantitative for its PG courses.
• Delhi School of Economics will teach mathematically to understand the contemporary style of economics. This will help you try for a Ph.D. abroad.
• JNUs teachings are much simpler and theories with less mathematical writing. If you want to sit for UPSC exams, JNU is really a good option.

Therefore, you need to choose wisely, pursuing Ph.D. would only be good if you receive a good piece of advice from your professors or someone who has appropriate experience.