there are many micro sd cards

I originally bought these U3s because my eyes glazed over once I saw ~1/2 million different specs and abbreviations on every Micro SD card listing:

But then, via @jonjonsonjr:

A[n] represents “application performance class”

So I bought these A1s from Amazon and went back to not thinking about it, because

Silicon Power 128GB R/W up to 100/ 80MB/s Superior Pro Micro SDXC UHS-I (U3), V30 4K A1, High Speed MicroSD Card with Adapter

is obviously superior to

Samsung 128GB 100MB/s (U3) MicroSDXC EVO Select Memory Card with Full-Size Adapter (MB-ME128GA/AM)