I understand your point. When I was introduced to jazz music Ella was my go to female vocalist. With more exposure and experience my preferences have changed. I much prefer Sarah Vaughan and definitely Carmen McRae. More interesting, compelling and emotionally engaging. They pull me into the music in a way that Ella just does not for me. Another example, early on Oscar Peterson, later, Thelonious Monk. Same reason. Certainly, horses for courses.
Charles