These products serve fundamentally different purposes: the Synology DS923+ is a multi-bay network storage server while the WD My Passport is a single portable SSD. The DS923+ wins for network-attached use cases with its 2.5GbE ports and DSM software per Synology specs, but the WD is superior for mobile single-user access at 1050 MB/s. Direct comparison is limited by mismatched categories.