Which stream has got more scope among B.Sc and BCA and why?

BCA is better as nowadays computers are on high demand

Currently BCA has more scope because it is a job oriented professional degree. You can stat your IT career immediately after BCA. But for a meaningful career you are advised to study up to MCA. B.Sc M.Sc is good option if you are interested in pure sciences and want to join R&D or acedmics career.