WD or Seagate? Hmmmm....
I've had good and bad experiences with most brands over the last 20 years or so, but I found this interesting breakdown of some real-world stats on HDD reliability. Shows a marked difference between Seagate and WD, and the ex-IBM, ex-Hitachi HGST drives.
https://www.backblaze.com/blog/hard-drive-reliability-update-september-2014/
Based on that I know where my money would be going. Spinning rust will be around for a bit yet.