Salted versus Unsalted butter---
I grew up with salted butter, when we weren't having Chiffon or I Can't Believe. . . for economy.
Now that I do my own shopping for myself, it is always real butter.
Unsalted butter goes rancid somewhat to extremely faster than salted butter. The snooty-tooty recipe writers say that the salt level varies, and for optimum results, "always" use unsalted butter. I know enough to decrease (but not omit) the added salt in a recipe, and no one has turned down my baking or other vittles!
Cook's Illustrated prefers Lurpak and Land O' Lakes. I usually get Land O' Lakes, because there is a great big Land O' Lakes plant here on the outskirts of town. However, if the other local brand, Sumner's, is on card special, I'll get it instead.
Butter is one of my most favorite things, ever.
My great-grandmother on my father's side always called the other stuff "CG," for "Colored Grease." She died in her late 80s, in the late 1940s. She took the rationing of butter during World War II as a personal insult.
Lawrence/Maytagbear