Consider what you need from your awnings.
I should get 90 Degree Awnings because:
I have North facing windows so I want less head in summer but I don't want to loose sun in the winter
My house has a very short eave and provides little to no shade or protection
I live next to a property that looks down into my window
I Should get 20 Degree Awnings because:
I have east/west facing windows and need more protection from the sun