Which course should I pursue amongst B.Com, B.Com honors and BBA? Which are the best colleges for the same in Delhi or Dehradun?

All are the best courses in their respective way. First, identify your interest. Based on that, you can take decision. After B.Com and B.Com honors, you can go for CA and other finance related areas. If not, choose BBA for other best functions like HR, Marketing etc. all the best.

Choose BBA as it's a professional course. https://www.shiksha.com/bba/colleges/bba-colleges-dehradun. Search the link for the best colleges in Dehradun.