Set up my first NAS last week and was looking around at drives for backups. Was comparing Toshiba N300 16TB and WD Red Pro 16TB, the Toshiba drives are much cheaper but have a few lower specs (Which probably don't make a major difference).
However, I also noticed the Toshiba has a 3 year warranty whereas the WD Red Pro has a 5 year warranty, which meant the WD was cheaper over a 5 year period than the Toshiba is over a 3 year period.
Not that I'm expecting the Toshiba to crap out at the 3 year mark, but how much weight you put on warranty when buying a drive? But I've also read plenty that Toshiba's warranty sucks, and WD's is going downhill.
My NAS has 3x8TB drives in SHR (or RAID5), and my plan is to eventually get another 8TB drive (4 drives total, 24TB usable) and a second 16TB drive for backups (2 drives total set to JBOD, 32TB usable). Then eventually get a second NAS, a third 16TB drive, and have a separate array (3x16TB).
So having a couple extra years of warranty seems worth it when it eventually gets put in an array. I see this as a good way of scaling without buying external desktop drives which inevitably stop being used because they're too small to be useful for my needs.