Use as wide a range of recordings as possible. Some "audiophile approved" records do not reflect what one might ordinarily listen to. I have a thing for ’70s era post bop- not exactly a high point in vinyl quality. But nonetheless revealing since many of those recordings were done without a lot of production. They will allow you to hear acoustic instruments in what are typically small groups.
Of course, if your diet consistent of highly produced rock, pop, or the like, you should use those too, since that is what you will be listening to, presumably.
Punchline for me: choose a wide range of different recordings. You want to hear strengths and weaknesses of what you are evaluating. The biggest hurdle is often translating that into what you’ll hear in your system at home. That’s why I like to audition gear in my system. I can pretty quickly get a handle on what it is doing, good or bad.