What do you use now? Plenty of people use IO or RC with fine success. In fact IO is often the go to salt for people who live by the water change mantra "Ooh I see diatoms growing on the glass, 10% water change needed!"
But I would probably stick with a particular salt unless you're seeing something bad with your existing salt. But if you want to save some money going the IO route is definitely a direction to go since that is the one that is most often going to be on sale, if anything because it's sold most everywhere.