Let’s cut to the chase. Get either the Seagate or HGST 4TB drives. Personally, I’d go for the 3x more reliable HGST drive that costs 30% more than the Seagate.
The 4TB drives continue to rock, with both Seagate and HGST 4TB drives performing well. The Seagate 4TB drive has a current cumulative failure rate of 3.0% and has a street price of $131.58 each on Amazon. The HGST 4TB drive has a higher street price of $174.99 on Amazon, but a lower cumulative failure rate of 1.18%. Both drives have been in service for over a year and we currently own 17,000+ Seagate and 11,000+ HGST 4TB drives and continue to purchase more.