I’ve updated the page describing my testing of various external hard drive options.
https://macinchem.org/wp-admin/post.php?post=1899
On my Mac Studio M2 Ultra the ACASIS 80Gbps M.2 NVMe SSD Enclosure with Crucial P310 4TB SSD M.2 2280 NVMe PCIe Gen4 (Thunderbolt) is the top performer at read 3025 MB/s and write 2836 MB/Sec.