You just check the best $?TB ratio and warranty time. That's really all the things you need when choosing the drive. Also, remember that there are only 3 brands Seagate, WD and Toshiba to look for.
Data Hoarder
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Toshiba 20tb. I have 7 piece and I'm satisfied.
If you can drop down just 2TB, Best Buy has 18TB EasyStore's for $199.
That's a really good price @ $11/TB, but I find it odd the 16 TB and the 20 TB of the same model cost more - $17.5/TB for 16TB and $20/TB for the 20TB