Placements of any course depend primalrily on the college and the academic and practical understanding of the subject matter by the student.

BBA Finance as well as BBA Marketing will open opportunities to profiles in large corporates and mid sized companies. 

BBA Finance however will also allow one to explore the career options in large consultancy firms such as PWC, Ernst & Young, KPMG, Deloitte,etc.

BBA Marketing is more likely to drive one towards advertising and sales oriented profiles unless one pivots and pursues a specialization course.

My advice would be that you understand the composition of subject matter in each of these courses and make an infomred choice based on your preference of subject rather than the placement opportunities.

If you excel in the pusuit of knowledge and academics, you are warranted to be succesful in any field that you enter.

Both BBA finance(bcom) and BBA marketing are really specialised courses.Both are equally important and both have lucrative jobs.

In BBA Finance you have career options like manager , accountant post and in BBA marketing you learn about customers , marketing skills . But if you go ahead like MBA in finance the placements are better in finance . 

But you should go with your interest. BBA in marketing is no less . If you give your best. You will be placed well.

wish you luck !