Question special

When applying for college and medical school, the advice I got universally was, "find the letter writers who know you the best." However, my fellowship application process was the first time that several people told me, "ask Dr. X to write you a letter. She may not know you, but she is a big name in her field."
How do you look at letters of recommendation? Is it more important that the letter writer knows the candidate well, or that he/she is a prominent voice within the specialty?