Verdict

Both are comparable SSDs. The SEDC600M/960G is rated for more write endurance than the WDS500G1R0C, so it's the longer-lasting choice for a NAS that sees steady writes; for light use either is fine and price decides.

SEDC600M/960G WDS500G1R0C
Capacity 0.96 TB 0.5 TB
Form factor 2.5 M.2
Interface SATA NVMe
NAND type TLC TLC
Endurance (TBW) 1,752 TB 1,000 TB
DWPD 1.0 -
DRAM cache Yes Yes
Power-loss protection Yes No
Sustained write 530 MB/s -
Price / TB $708.36 $429.98

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB uses the cheapest live price where available.