When you’re putting together your Raspberry Pi projects, you likely just grab whatever microSD card is on sale without thinking much about it. However, over on Midwestern Mac, they did speed comparison between cards, and found a big difference in performance.
Testing over a dozen cards, they found that the card’s speed drastically affected performance, with cheaper cards performing significantly slower than name brand ones. The winner, when cost is factored in, was the Samsung EVO+ Class 10 card, which typically comes in around $25. If you’re interested in the testing methods and some more details, head over to Midwestern Mac. Obviously this isn’t entirely comprehensive, but it covers the bases well enough considering how cheap microSD cards are these days. It sounds like the Samsung EVO and EVO+ cards are you best bet when you’re out shopping for a card for your Pi.
Raspberry Pi microSD card performance comparison 2015 [Midwestern Mac, LLC]