D.Pharma

Actually, both are best depending upon student interest, a Diploma in pharmacy students can work as a pharmacist in clinics or government hospitals or even start their own pharmacy. If not interested can do further higher studies for placement in the pharmaceutical industry or working in R&D, this kind of job can pay high salaries. On other hand studying for B.Sc. can work in an executive role in life Science and biotech companies, want high salaries in the same field needs multiple degrees and skills that can only decide the job position and salary. In the current situation in India, a single degree can't pay a high salary until starting their own company with interesting ideas and strategies. So don't compare a course, think about what you want in the future.

Yes, you can opt for Pharma. D after D.Pharma but you will have to choose among the two options:
1. Either enroll in a Bachelors degree in 2nd year directly after D.Pharma and then get enrolled in Pharma. D for PG. This will take 6 years (3 B.Pharma + 3 Pharma. D PG)
2. Better option is to get enrolled completely in a Pharma. D course from the start itself. This course is of 6 years including one year hospital internship (preferable). The syllabus for B.Pharma and Pharma. D UG are similar but Pharma. D syllabus is more concentrated on the clinical aspect of pharmacy. So it is better if a person is interested in Pharma. D then he should opt for it directly rather than doing B.Pharma.