Scott’s way is organic. My way is for convenience’s sake. Since I spray Spectracide Immunox for apple cedar rust, it also helps with scab and powdery mildew. So, myclobutanil ( the brand I use is Immunox) is what I use.
If you read the label, you are supposed to spray for pm at one stage and scab at a different stage. Me, I just spray after petal fall 10-14 days apart. That’s all I need.