Answer:
I think RN is your best bet. It is the most versatile and easiest to work with.
Explanation:
RN
Pros: Get to interact with people
Doesn't require as many qualifications
Cons: Doesn't make a lot of money
Emotionally draining
Phyiscal Therapist: High paying
Get to interact with people
Cons: Requires many qualifications
Emotionally draining
Radiation Therapist: Highest paying
Requires many qualifications
Cons: Requires a lot of degrees
If you mess up, you could be facing a lawsuit.
Hope this helps!