I'm running out of storage space on my Synology NAS and I"m thinking of adding another device.

Current options are an updated 2 bay device Synology DS213J 10TB (2 x 5TB) 2 Bay Desktop Network Attached Storage which can accommodate upto 10TB of storage. Alternatively I could go for the 4-bay device Synology DS416 12TB (4 x 3TB WD RED) 4 Bay Desktop NAS which offers greater capacity, or similar capacity with 4 smaller drives.

Any views on the reliability of the larger capacity HDDs ?