Kosher salt has its place in cooking, usually added at the end. But for baking, brining, boiling, or anything that needs to go through fine mesh, pickling salt is the bomb. Fleur de Sel and other sea salts are way overrated. Not much bang for their buck.
Funny is that if you want to make a nice Kosher corned beef, pickling salt is used.
Pickling salt - Wikipedia, the free encyclopedia
AP proposes that pickling salt is an equal to rock salt and kosher salt, but superior to that iodized shit.