I'm one that typically saves higher/the highest resolution I can because storage is cheap, so why not?
however, the thing with these types of "tests" is that it is testing whether you are able to tell the difference when sitting and concentrating on it. when considering what format to purchase to keep, you should be considering how much of a difference does
320 vs. wav matter to you and how often will you be listening that closely for it to matter?
it's why I think services such as spotify, apple music and amazon music are great. I can stream a lot of music I enjoy while running, doing yard work, etc. I can then choose which albums that I'd like to listen to on a format such as vinyl.