The "nutrient density" of any salt is negligible. It's all marketing. Focus on taste.
Discussion
You don’t think the source of where something comes from influences the mineral content of it? I.e mineral poor land grows mineral poor food?
Sure, on a minute scale, but the only thing those can provide in any *meaningful* amount is sodium and chloride.
Is the only meaningful compound in tap water, water? Or the minute amount of fluoride in it? Some trace elements don’t require much. I get your point but I tend to think consumption of anything at the margin can yield grander effects over the long term.
Think:
1) Look at the volume of water you consume in a day vs the volume of salt
2) There are no minerals in any salts that have such a minute daily requirement that you can reach that requirement by using a small amount of salt. You WILL meet those requirements, and then some, with proper food intake
Salt is seasoning, nothing more. Trying to decide on a salt to use based off of its alleged mineral content is a waste of time, energy, and possibly money.
