The best courses offered by colleges depend on various parameters. Some of these parameters are faculty base, effective working of the department, placement opportunities provided by the institute, etc. I have a few friends from St. Stephens, Hindu College, and Hansraj College. 

According to them, here are some of the courses that are quite reputed in these colleges. 

• Hansraj College - B.Com (Hons), Geology (Hons), History (Hons)
• St. Stephen's College - Economics (Hons), History (Hons), English (Hons)
• Hindu College - B.Com (Hons), Political Science (Hons), Economics (Hons)

Hope this clears your doubts.