Before i decide to buy which SD card will work okay in the Nikon D7100 what is the difference in these two cards one has the number 1 on it the other has the number 3 on it.
SanDisk 64GB Extreme Pro SD Card (SDHC) - 95MB/s UHS-I U3 £57.99 - Free Delivery
SanDisk Extreme Pro SDXC UHS-I Memory Card: Amazon.co.uk: Computers & Accessories
SanDisk 64GB Extreme Pro SD Card (SDHC) - 95MB/s UHS-I U3 £57.99 - Free Delivery
SanDisk Extreme Pro SDXC UHS-I Memory Card: Amazon.co.uk: Computers & Accessories