I switched from reef crystal to HW Marine and I love it. Great response from corals. Color and polyp extension improvement. It's more expensive but I estimated I would only get about 1 box per year so it's not too bad for me.
Your best bet is to go with the salt with the parameters you're targeting. I know it's kind of tough.
I was a long time reef crystals user & switch over to Fritz last yr. It's a pretty popular salt on the market now. Two little fishies has come out with a new salt & I've heard nothing but good things about it. Also, heard of great things about HW Marine as above.