What should i look for in an HDD for a NAS?

[Mallers]

Hello, what should i be looking for in a NAS drive pls? After a 20tb drive, seen the usual suspects like Iron Wolf and WD red, which seem to be the best. Also seen a WD enterprise drive, this model:

WD Ultrastar DC 0F38755 20TB 3.5" SATA Enterprise HDD/Hard Drive​

is this any good? seems to be a bit cheaper than WD red, but i am assuming its probably not as good? Ive seen on a different thread lower rpm may be quieter, although suspect tv will drown most sound out. Should i worry about if a drive had 256 vs 512 mb cache at all?
Any advice welcome, thanks!

 

[Snapshot]

I don't think there's much to choose between Red Plus and Iron Wolf; it's safe to go with whatever deals you can find.
I believe, at that capacity, you will only find 7200rpm drives.
Another option is to shuck the drives out of WD Elements external drives. The white-label drives inside are suspected to be WD Reds in the smaller sizes and HGST in the larger. I wouldn't worry about cache sizes at all.

 

[Mallers]

thanks!