Baking With Salted Vs Unsalted Butter. Salt acts as a preservative so salted butter has a longer shelf life than unsalted options. We may not be able to taste or smell if our butter is off because clever clever salt can mask funky taste and odors.
Unsalted Butter in baking and which one YOU should be usingFULL post here. When in doubt reach for the unsalted variety. Unsalted butter with added salt.
For baking purposes the Test Kitchen recommends using unsalted butter so you can better control the amount of salt that goes into the recipe.
I like to add the salt to taste. Talking all about Salted vs. If you use unsalted butter and add your own salt then youll get more consistent results. That being said there is a reason that bakers myself included and just about all other cooks use unsalted butter as their kitchen staple instead of salted.