Hi Rohith,

See there nothing like what is best for becoming a scientist. Both degrees can lead you to path of becoming a scientist. Usually what happens in Physics is that there is a division of scientists called theoratical scientist which is often more conviniently done by opting BSc as not much technical application is required but both the profile are very good. You will haave to complete your PhD in either case. Whatever you see yourself doing in case you don't end up as an scientist take that.

Good Luck !!