Seagate IronWolf Pro 18TB outperforms the WD Red Pro 18TB by 29 MB/s in sustained transfers according to Tom's Hardware and offers higher MTBF per Seagate specs. Both drives share 7200 RPM, 256 MB cache and 5-year warranties making them close in value. The IronWolf Pro's AgileArray firmware provides better multi-bay vibration handling per StorageReview testing.