Verdict

For a NAS cache or any write-heavy pool, the SEDC600M/7680G is the safer pick - the SBFPF2BV076T001 uses QLC NAND, which wears out faster and slows down badly under sustained writes. Only consider the SBFPF2BV076T001 for light, read-mostly storage.

SBFPF2BV076T001 SEDC600M/7680G
Capacity 7.68 TB 7.68 TB
Form factor U.2 2.5
Interface NVMe SATA
NAND type QLC TLC
Endurance (TBW) 5,900 TB 14,016 TB
DWPD 0.4 1.0
DRAM cache Yes Yes
Power-loss protection Yes Yes
Sustained write 1,800 MB/s 530 MB/s
Price / TB $427.10 $491.84

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.