Salt question, not a poll. Sorry.

[Aquattro]

Of the two, I'd be using IO. Nothing wrong with it other than a bit inconsistent, but a quick test for Ca/alk will tell you where the bucket sits. Fluval, IMO, is way too high in Ca and not worth the money.
Once you're in the city, pick up a bunch of IO. It's a good mainstay salt that you won't go wrong with.