Dear student,
There really cant be a better course or a better job. Every occupation has it's own importance and place in the society. But at the end of the day, if you are too choose between BDS and B.Sc, first of all, see what is your calling. Whichever course you are passionate about, that's what should be your key. If you are into selflessly helping people, then you will have a good time pursuing B.Sc nursing.
Since both are of the medical field, you don not need to be reminded that the study of both are going to be requiring immense hardwork from your side.
If you want the Dr. initials before your name, you know what to choose. Jokes apart, if you are planning to settle in India, then in terms of money and social status, BDS will be a better option. But if you have plans of studying abroad, B.SC nursing wouldn't be a bad idea.
In the end of the day, it is really your call. Go for what your gut says, and you will see yourself satisfied.
Good luck!