Both the courses you have mentioned are good. But if you want to go for a course that provides more clinical exposure i.e., if you aspire to become a physician the BDS will give you a better scope to explore the field. Now if you want to be associate with medical field and want to accompany doctors in order to make the process quick and do research in the field so that the medical practioners gets new ways to treat patients then NMT can be a good choice. Career wise both are good but you have to choose based on your aspirations and goal.

To know more about NMT visit the link below:

https://www.careers360.com/courses/nuclear-medicine-course

To know more about BDS visit the link below:

https://www.careers360.com/courses/bds-bachelor-of-dental-surgery

I hope this answer helps. All the very best for your future endeavors!