"Thanks to the 7200 RPM speeds, the WD Red Pro does manage to acquit itself well in the overall performance category. Though it is not the absolute best, it performs admirably well in the sequential access patterns segment of the multi-client evaluation.
The WD Red Pro doesn't deliver the lowest power consumption. Those were recorded, as expected, with the 5400 RPM WD Red and the HelioSeal-technology based HGST Ultrastar He6. However, the WD Red Pro provides a good balance between speed and energy efficiency.
The WD Red Pro 6 TB version is priced at $300. At this price, users can also purchase the HGST Deskstar NAS 6 TB (though Newegg has reduced pricing for multiple disks in this case). The Seagate Enterprise NAS HDD comes in at $305, while the Enterprise Capacity v4 version comes in around $450. The choice at the $300 price point for 1-16 bay NAS units comes down to the WD Red Pro and the Seagate Enterprise NAS HDD. As mentioned earlier, the choice depends on the expected workloads...Read more
Source: Anandtech.com