Both are different subjects. 

In Bcom, you study variety of subjects: Accountancy, Business Administration, Finance, Economics and Industrial Policies. This course equips one with the analytical, communication and problem-solving skills to effectively identify issues, source information and to find efficient and practical solutions. After B.Com the students can avail exciting and diverse post graduate opportunities like MBA, LAW, International studies, Designing/Merchandising, MBE, M. Com, Finance, Economics etc which will set them apart from the crowd and prepare them for success in the global marketplace. The industry takes them at par with the students having professional degree like BBA, Hotel Management etc and sometimes at higher platform if someone is from reputed college. All most all universities and colleges in India offer B.Com degree, therefore, chances of getting into the course is higher.

BBA is a professional course. After BBA the students can get into Marketing, Human Resource, General Management, and Finance etc. This course, however, restricts the students from other postgraduate study opportunities.

If one follows up his BBA with an MBA degree from a reputed institute then they have a chance to increase their job prospects along with high salary package.

All the best.