My CMRs have been running 24/7 for 2 years without any smart errors

I agree - I am very happy with the WD Red (but in combination with a round Synology NAS. Make sure you buy the CMR variant (not the SMR - that was a topic for me 3 years ago)

Hi chanpa, the Western Digital Red series is best suited for NAS. So if you want to use a WD hard drive in your NAS, I would go for this series. There are of course other manufacturers, but I have had very good experiences with WD. Best regards