|Samsung EVO Plus microSDXC|
Many professional photographers and videographers swear by SanDisk Extreme and Lexar Professional memory cards because they have proven to be tops in reliability and performance.
But as of September 2018, arguably the best card for GoPro HERO (and for most other devices) is the Samsung EVO Plus (2017 Model). With Class 10 U3 speed (up to 100MB/s Read and 60MB/s Write), the 64GB capacity (with adapter) is widely available for only $21.
For reliability and performance, format cards with the official SD Association Memory Card Formatter.
Counterfeit cards are a huge problem. To protect against counterfeits, always (a) buy from a major reputable reseller like B&H, and (b) test before use with H2testw 1.4. Example of testing a 64GB Samsung EVO Plus in a Lenovo ThinkPad T460p:
Test finished without errors.(After testing with H2testw, be sure to either delete the test files from the card or format the card.)
Writing speed: 57.7 MByte/s
Reading speed: 70.2 MByte/s