AP vs. bread flour
I usually bake with a mixture of KA White Whole Wheat and General Mills Better for Bread. The local Safeway stopped carrying the BfB. I baked a few times using some General Mills AP rather than BfB. I was disappointed in the results. My loaves seemed dry, flat, and blah. I found another local supermarket that carries the BfB, so I was able to bake with that again. Big difference! Loaves rose higher, seemed moister and more flavorful.
It's a bother having to shop at two stores to get the flour I need, but that's better than flat, dry bread.