A lot of my friends studied at Delhi University. According to them it is a really good institution and is preferred by both local and outstation students.
The colleges are more or less the same. The only aspect in which the colleges differ is placement. There are certain colleges were some good companies come to recruit students and you can expect a good-paying job from them. These include St. Stephen’s College, Shri Ram College of Commerce, Lady Shri Ram College, Hansraj College, Hindu College.