At least from a few years ago when you could meet and talk to people, the company that makes Fritz makes 3 or 4 other brands with just different labels. Kirkland and Members Mark salt probably coming soon... :)
Outside of a bad batch, the salt is not going to matter much. Bad batches do happen - this is real. This is one of the main reasons that I use IO.
If you mostly like a salt, then doctor it up. You only have to figure out your recipe once. Then, just repeat. All that you need is carbonate, calcium and mag test kits, calcium chloride, baking soda (doubtful, but maybe), mag chloride and muriatic acid I figured mine out years and years ago - 50g bag of IO in cold RO with 2 tbsp of dowflake (ca cl), mix overnight, 20 mls of muriatic acid, mix and heat, ready to go in a few days. Your tank is worth a few minutes.