I'm using spree 2.1.5, rails 4.0.2, sass-rails 4.0.0.
The spree documentation at http://guides.spreecommerce.com/developer/asset.html indicates using the vendor/assets/stylesheets folder. However, examples I see of spree stylesheet overrides on Github and from other google search show many people using the app/assets/stylesheets folder.
Is it best to override spree styles in the folder my_store/app/assets/stylesheets? Or my_store/vendor/assets/stylesheets?