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Always use unsalted butter in cooking or baking(especially); it gives you greater control of total salt content. If you are using it directly on something(toast, bagels, etc...) then you may want to use the salted variety, as it may be too sweet for some.
If you are using it for any type of extraction then you definitely want to use unsalted, as the salt aids in the oxidation process. You also want to clarify and simmer the butter to remove the milk solids, any moisture(white boundary layer between the solids on the bottom and the oil on top), and to fix the proteins; pretty much the same thing as Ghee. This will provide a base oil that is more resistant to oxidation and degradation than just using standard salted butter.