A few questions.
City or well water? What is in your water that you are trying to remove? If municipal water, is chlorine added to the water by the municipality? What is your hardness level?
Number one rule of water softener is that it can be removed , not replaced, or replaced, without disruption to the water supply to your home.
If well water is used, the softener must be recharged at a minimum of every 96 hours. You will want a controller that will do that.
My recommendation is to have a plumber prep the home for a water softener. Buy a fleck controller and the resin yourself, and do the install. The resin you pick will have a big impact. Almost no softeners come with the good resin, they almost always come with the cheap resin.
Currently I am running two softeners..one inside, with a fleck controller and will r chard every 400 gallons. I am also running a seasonal outside softener, which I can wheel into the garage when freezing weather approaches.
Whatever you do, think long and hard before calling out a local water softener company. Water softener salespeople often make slimy used car salesman look honorable.