As a healer, because I feel it's an important job, and having the power of life and death and the ability to save a situation through sheer skill is immensely satisfying.
As a scholar specifically, because I love class with pet and that the versatility of the job is really fun to play with.
And more specifically, this answer every question about the healer role : https://www.youtube.com/watch?v=2DxS7eT_ky4