Hey,
Both B.Sc in Computer Science and Bachelor of Computer Applications(BCA) are good and it entirely depends upon your calling. Be sure of your interests and choose accordingly. Both these courses come up with ample career opportunities,so they must not be weighed on the same scale.
B.Sc in Computer Science is a three year undergraduate programme which deals with subjects and topics related to computer application and services. You can work as System Integrator,System Analyst.
Bachelor of Computer Applications is a three year undergraduate programme that deals in Computer Applications. You can work in software developement,banks,government departments.
Hope this helps.
Good luck.