I wish SD Cards also had some specifications for random access speed.
I used to have a UHS-I SanDisk card which felt much faster than my current UHS-III Samsung card. It’s really evident when searching through the storage, waiting for photo thumbnails to cache, etc…
I am not sure whether to go for a UHS-I SanDisk or UHS-III Samsung next. That SanDisk might not handle higher bitrate 4K.