I will give a go at this from the perspective of a softener layperson, sometimes proficient handy person. I sized and installed a quality softener about 3 years ago after spending months here educating myself. These are strictly my subjective opinions.
- I have the impression that name brands like Culligan and Kinetico tend to be over priced and may contain proprietary parts that will further cost you more money if maintenance is needed.
- To me, it seems that cabinet models are less desirable than the two tank system (resin tank/brine tank). Who wants the valve controls inside the brine tank with the salt fumes and humidity? Pros, am I wrong?
- Box store units often seem to be dumbed down versions. I recently looked at a Pentairre model sold at Blaines Farm & Fleet and it had a dumbed down Autotrol valve and only 0.8 cu. ft. of resin.
- Excellent units are made up of somewhat generic components: controller/valve, tanks, resin, etc.. The pros here ascertain that internet models might have cheaper tanks and components compared to models purchased at a professional jobber supply house.
- The 3 U.S. made quality valves are Fleck, Clack, and Autotrol. These are component brands, not softener brands. Unfortunately, I "think" it is now difficult for consumers to buy softeners with these valves - they need to be sourced through a professional plumbing supply (Need verification of this).
Best brand? I believe you need to rethink this. Shop for a softener with best components. It likely will not have a brand name that you recognize. I.E., my local jobber sells Charger brand softeners that you can buy with either Fleck, Clack, or Autotrol valves. I don't have knowledge of their other component quality, but my first one lasted 18 years and I'm now 3 years trouble free on my second one.