WOW ! Huge difference between the 2 card readers………
A quick video testing Sandisk / Apple UHS II USB-C card readers for the iPad Pro, you will be surprised at the difference.
Sandisk Card Reader :
Video shot on :
Lumix Leica 12mm f/1.4 Summilux Lens.
Lumix Leica 12-60mm Lens.
Sennheiser AVX wireless system