They all seem very similar to Shark Bite fittings. I like the Shark Bite fittings because they’re just as easy to take off as they are to install(with a tool, of course). They also work equally well with copper, PVC, or PEX. The normal PEX crimp fittings are a bit less expensive, but one use is all you get. Better do it right the first time. I’m looking into some permanent plumbing for the hot side process and deciding what I think is gonna be best for ease of use and maintenance. I should be able to circulate boiling water and sanitizer(not boiling) to keep critters at bay when I get done. I’d use tri-clamp, but that stuff gets pricey fast. I have to keep reminding myself this is not something I ever plan to do for distribution when I start buying goodies.