Class 10 UHS 3, 4K. faster speed, newer & more expensive. I have trouble burning and viewing video from a UHS 1 4K SD card on my computer 2 years ago then I found 2 software can do it. I believe the latest computer should work on 4K SD now. Samsung S8 can use UHS 3 for faster speed. Either one is OK. I have ScanDisk & Samsung EVO VHS 1 & 3. I use either one on my new or old devices (phones, tablets, cameras & camcorders).