i know that butter is better than margarine and that it is better to buy the best you can but should you use an unsalted butter or does it not matter when making cakes and buttercream?
I did use salted butter in cakes until I heard from a professional cake decorater that unsalted butter was best -so switched to unsalted, I think that the flavour is much nicer - its also an excellent choice for buttercream.
Hope this helps
I use salted - Tesco value butter (unless something else like Lurpak is on offer at 2 for £2!!)
I use salted butter for cake--but I skip all the salt in the recipe, and I mix my own self rising flour without salt. I also use margarine, they have improved the manufacturing process in the last few years so that you should not be afraid to use it. Margarine is still healthier than Trex.
For buttercream, unsalted is the best. You can always add a pinch of salt, which is a lot less than the salted butter is allowed to have.