Verdict

Both are comparable SSDs. The MTFDKCC3T8TFR is rated for more write endurance than the SEDC600M/3840G, so it's the longer-lasting choice for a NAS that sees steady writes; for light use either is fine and price decides.

MTFDKCC3T8TFR SEDC600M/3840G
Capacity 3.84 TB 3.84 TB
Form factor U.3 2.5
Interface NVMe SATA
NAND type TLC TLC
Endurance (TBW) 7,300 TB 7,008 TB
DWPD 1.0 1.0
DRAM cache Yes Yes
Power-loss protection Yes Yes
Sustained write 5,000 MB/s 530 MB/s
Price / TB $986.72 $261.71

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.