Samsung Evo+ cards with the same speed rating (say U1) and model number can vary in performance quite a bit. I have tried three of them on my rpi4, and found on

Samsung Evo+ cards with the same speed rating (say U1) and model number can vary in performance quite a bit. I have tried three of them on my rpi4, and found one which was considerably faster than the others. To be sure I verified it with crystaldiskmark and indeed, it was up to 2x faster in writes and reads. Samsung cards tend to outperform other brands in that price range.