USB2 is still faster than all but V90 class MicroSD cards. And V90 cards are only rated for 90MB/s writes, not reads. Even if you had a UHS-III V90 A2 card, a

USB2 is still faster than all but V90 class MicroSD cards. And V90 cards are only rated for 90MB/s writes, not reads. Even if you had a UHS-III V90 A2 card, a USB2 SSD is going to give you 10x the IOP/s performance.