When trying to decide to write about anything, here is my advice to you—write about what most interests you. Thus, my first recommendation to you is to write about the artist whom you most like. My second recommendation to you would be to write about the artist who has the most written about him/her. If there is a lot written about your topic, your research will be easier, and you’ll have more perspectives from which to choose as you vet your sources. Lastly, if, however, all three artists are equally as popular, and have an equal amount written about them, then, I would suggest going with the one whom you most recently read up on because you’ll be able to write more with information that is still “fresh” in your mind.