So other than price whats the difference between the both?

One has iodine one dont....

What would you guys buy from the food store if I do get that salt cause I already spent 10bucks on the aqurium salt.

Spots are slowly going away. And all I did was 1 30%water change with about 18tsp of last and rasing the temp to 90 degrees

You shouldn't raise the temps that high. I wouldn't go above 86. The temps speed up the lifecycle of the Ich. The Ich won't die until it drops off the fish and becomes free swimming. At that point is when the salt and heat does its work. I would keep adding salt and lower the heat as I said before. If you already bought aquarium salt you should just use that.