I usually buy unsalted. I'm generally a fan of salty foods so I figure it makes sense to get the unsalted butter to try and cut down just a bit. Not sure it makes an appreciable difference though.

I like the Breakstone unsalted butter than comes in the tub for toast, and on vegetables. I only dab on a little, just enough for taste, because of the high fat content in butter.

For regular cooking, I only by unsalted butter in sticks. You get plenty of salt in most other foods since salt (or sugar) is the preservative in most of the "No Preservative Added" foods.

I only buy unsalted butter and have never had a problem with spoilage of butter.

I always go with the salted also.

I always do the salted. I simply prefer the flavor.

But, it's defintely good to have the info on salted vs unsalted. I can see where it would be valuable to use unsalted in some recipes. Thanks for the info!