These products serve fundamentally different purposes with no direct overlap: the Sony Tough M is a rugged UHS-II memory card for cameras while the WD Black SN850X is a PCIe 4.0 NVMe SSD for computers. The WD delivers 26x faster reads (7300 MB/s vs 277 MB/s) and 16x the capacity (2 TB vs 128 GB) per the provided specs, but lacks the Sony's water/dust/drop/bend proofing. They are not comparable ...