The issue is if they are using a USB3 port, [ now USB 3.1 Gen 1]. They are going to be limited by the port speed, [4.8Mb/s], on any recent SSD or other Solid state drive such as M2 based SATA or NVMe
There is also a bit of confusion over terminology, the main one is the Type-C which is not a speed rating but a plug/socket type, you could fit a USB-A to USB-C adaptor to a USB1.2, USB2 or USB3 rated source and it's a basic case of What goes in is what comes out
It's only when a USB-C plug/socket is connected to a USB3.2+ source that you will see the full performance of current Devices
The same applies of course to M2 which is also not a speed rating But in this case a Mounting system which can accommodate SATA or NVMe and potentially other future options. [In another configuration I have used an M2 motherboard connector to connect an Optane Memory module, used as a Buffer for a HDD to speed up access ]