TOTW is an OK food. On the one hand, it’s grain free, and they have a few “semi limited ingredient” diets for dogs with mild sensitivities. Its price point makes it a good introductory grain free diet. On the other hand, while it is grain free, it is high in actual carbohydrate content. It is also manufactured by Diamond, a disreputable dog food company with a history of many recalls. TOTW itself was recalled a few years ago.
Here on DFA, they are both rated similarly. I think if your dog is responding well to the Pure Balance (losing weight appropriately), you like its price point, and your vet has no concerns, I would stay with Pure Balance. There is no rule, however, that you could rotate between the foods to give her something different.
