Verdict

Both are comparable SSDs. The MZ7L31T9HBLT-00W07 is rated for more write endurance than the SB-RKT5-1TB, so it's the longer-lasting choice for a NAS that sees steady writes; for light use either is fine and price decides.

MZ7L31T9HBLT-00W07 SB-RKT5-1TB
Capacity 1.92 TB 1 TB
Form factor 2.5 M.2
Interface SATA NVMe
NAND type TLC TLC
Endurance (TBW) 3,504 TB 700 TB
DWPD 1.0 -
DRAM cache Yes Yes
Power-loss protection Yes No
Sustained write - -
Price / TB $445.18 $199.99

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.