Their new 8 TB Seagates are failing at a 1.6% failure rate at 3 months, which is the best that they have seen from any Seagate drive. HGST still seems to top their list for reliability.
https://www.backblaze.com/blog/hard-drive-failure-rates-q3-2016/
https://www.backblaze.com/blog/hard-drive-failure-rates-q3-2016/