DSE doesn’t offer bachelor's in Economics. However, most other colleges under DU offer BA in Economics.
BBE is a more professional course and focuses on the application in business scenarios. While BA Eco covers the theoretical aspects of Economics. If you want a career in academics or want to pursue research in the field, BA Eco will be the right choice.
These are the best Indian colleges for a bachelors’ in economics-
The ones that follow merit based admissions, mainly look at the Math and English scores of the candidates. Some of them take Math scores quite seriously. It is even better if you had economics as a subject in your +2.
An economics background may give you some benefit in the cutoffs. Some others follow entrance test based admissions. They’ll consider both your +2 marks and test scores (more weightage to +2 marks). You may consider a UG abroad, it is totally worth the trouble.