Verdict

Both are CMR drives suitable for NAS. The MG07ACA14TE has the lower measured failure rate (1.18% vs 2.18% AFR), making it the safer long-term choice.

MG07ACA14TE ST14000NM000J
Capacity 14 TB 14 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class Enterprise Enterprise
Spindle speed 7200 RPM 7200 RPM
Cache 256 MB 256 MB
Noise (idle) 20 dB -
Fill Helium Helium
Interface SATA SATA
Failure rate (AFR) 1.18% 2.18%
Price / TB $29.71 -

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB shows once live prices are wired.