Start by checking your water hardness level. You can grab a simple test kit online or call your local water company. If your water is super hard (like, over 10 grains per gallon), go for the salt-based system. It’s the most powerful. If it’s moderate, salt-free or magnetic might do the trick.
Also, think about space and maintenance. Salt systems need a tank and occasional salt refills. Salt-free ones are smaller and almost zero hassle. Which vibe fits your life better? Are you a “set it and forget it” person, or someone who doesn’t mind a bit of DIY?