My most recent experience with Apple's documentation (regarding some iOS 13 API concern), left me with a sense of impending doom and hopelessness. After about 5 minutes I gave up and went back to playing the google/stackoverflow search game.
I have become very addicted to the quality of Microsoft's documentation for things like .Net Core & C#, and have found it virtually impossible to tolerate reading documentation from any other vendor at this point. A completely arbitrary but hopefully obvious side-by-side comparison:
Exhibit A:
https://docs.microsoft.com/en-us/dotnet/api/system.linq.enum...
Exhibit B:
https://developer.apple.com/documentation/coreimage/cicolor/...