Speed over silence, basically. At 7,200 rpm it's quicker than the 5,400 rpm crowd, and it'll suit a small box that lives out of earshot. It's CMR, which is what you want anywhere near a RAID or ZFS rebuild.
!Watch out for
If there's any chance you'll move to a bigger box later, a pro line saves buying drives twice. The trade-off is three years' warranty and a 180 TB a year workload rating, which is fine for a media library that mostly sits there and tight if you shift terabytes around every week (scrubs and rebuilds count towards it too).
No Backblaze failure rate for this one. They don't run enough of them, if any, for a figure worth quoting. On paper it makes 28 dB at idle and 32 dB seeking. Seagate lists 7.8 W at idle and 10.1 W working, which comes to 68 kWh a year for a drive that idles around the clock. A 4-bay box full of these gives 30 TB after one drive's worth of parity.
Specifications
Each value links to the Seagate page or datasheet it came from.