This is a question which is like asking which hand is best the left hand or the right hand ?

So the result is Doctor or Scientist both work hand in hand. The discoveries of the scientist are often applied by the Doctor for treating patients. For example, there are Scientist who study the Virology and from that researches the doctors use them with the experience of there clinical studies and treat patients who are affected by Viruses.

So you need to choose what you like to be and how you imagine yourself in the future. Based on that take decision. Once you have a passion for the subject you will excel in it.

To know more about Doctor, visit the link below:

https://www.careers360.com/careers/doctor

To know more about Scientist, visit the link below:

https://www.careers360.com/careers/scientist

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