Verdict

Both are comparable SSDs. The SB-RKT4P-1TB is rated for more write endurance than the MZ-V9P1T0, so it's the longer-lasting choice for a NAS that sees steady writes; for light use either is fine and price decides.

MZ-V9P1T0 SB-RKT4P-1TB
Capacity 1 TB 1 TB
Form factor M.2 M.2
Interface NVMe NVMe
NAND type TLC TLC
Endurance (TBW) 600 TB 700 TB
DWPD - -
DRAM cache Yes Yes
Power-loss protection No No
Sustained write - -
Price / TB $204.12 -

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.