When they say SanDisk Extreme micro SD card is faster their Ultra version, in what sense is it faster? Will the difference be noticeable when they're being used in a phone? -
The best SanDisk SD card for your digital camera – Pretzel Logix
Speed Class | SD Association
microSD and SD Card Buying Guide | TechSpot
What's the difference between SanDisk Ultra red and white SD cards? Both are “ultra” : r/computers